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Journal of Integrative Plant Biology

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https://www.readbyqxmd.com/read/28805951/plant-reproduction-recent-discoveries-from-china
#1
EDITORIAL
Li-Jia Qu, Meng-Xiang Sun
Sexual reproduction in higher plants consists of several major biological processes which include mega- and micro-gametogenesis, male-female communications, embryogenesis and endosperm development. Male-female communications include male gametophyte-sporophytic tissues (stigma/transmitting tract) interaction and male-female gametophyte communication, during which various signaling pathways are involved.
August 14, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28783252/the-polyketide-synthase-ospks2-is-essential-for-pollen-exine-and-ubisch-body-patterning-in-rice
#2
Xiaolei Zhu, Jing Yu, Jianxin Shi, Takayuki Tohge, Alisdair R Fernie, Sagit Meir, Asaph Aharoni, Dawei Xu, Dabing Zhang, Wanqi Liang
Lipid and phenolic metabolism are important for pollen exine formation. In Arabidopsis, polyketide synthases (PKSs) are essential for both sporopollenin biosynthesis and exine formation. Here, we characterized the role of a polyketide synthase (OsPKS2) in male reproduction of rice (Oryza sativa). Recombinant OsPKS2 catalyzed the condensation of fatty acyl-CoA with malonyl-CoA to generate triketide and tetraketide α-pyrones, the main components of pollen exine. Indeed, the ospks2 mutant had defective exine patterning and was male sterile...
August 7, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28782920/potassium-channel-akt1-is-involved-in-the-auxin-mediated-root-growth-inhibition-in-arabidopsis-response-to-low-k-stress
#3
Juan Li, Wei-Hua Wu, Yi Wang
The changes in external K(+) concentrations affect plant root growth. However, the molecular mechanism for a plant perceiving K(+) signal and modulating its root growth remains unknown. It is hypothesized that the K(+) channel AKT1 may be involved in low K(+) sensing in Arabidopsis root and subsequently regulate root growth. Along with the decline of external K(+) concentrations, the primary root growth of wild-type plants was gradually inhibited. However, the primary root of akt1 mutant can still grow under low K(+) (LK) conditions...
August 7, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28782297/a-reciprocal-inhibition-between-arid1-and-met1-in-male-and-female-gametes-in-arabidopsis
#4
Lei Li, Wenye Wu, Youshang Zhao, Binglian Zheng
Both female and male gametophytes harbor companion cells and gametes. MET1, a DNA methyltransferase, is down-regulated in companion cells. However, how MET1 is differentially regulated in gametophytes remains unexplored. ARID1, a transcription factor that is specifically depleted in sperm cells, is occupied by MET1-dependent CG methylation. Here, we show that MET1 confines ARID1 to the vegetative cell of male gametes, but ARID1 conversely represses MET1 in the central cell of female gametes. Compared to the vegetative cell-localization in wild type pollen, ARID1 expands to sperm cells in the met1 mutant...
August 7, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28776932/snail1-is-essential-for-female-gametogenesis-in-arabidopsis-thaliana
#5
Lihong Hao, Xiaolin Wei, Jiulei Zhu, Jiao Shi, Jingjing Liu, Hongya Gu, Tomohiko Tsuge, Li-Jia Qu
Two yeast Brix family members Ssf1 and Ssf2, involved in large ribosomal subunit synthesis, are essential for yeast cell viability and mating efficiency. Their putative homolog exists in the Arabidopsis genome, however, its role in plant development is unknown. Here, we show that Arabidopsis thaliana SNAIL1 (AtSNAIL1), a protein sharing high sequence identity with yeast Ssf1 and Ssf2, is critical to mitosis progression of female gametophyte development. The snail1 homozygous mutant was nonviable and its heterozygous mutant was semi-sterile with shorter siliques...
August 4, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28731217/small-rnas-in-regulating-temperature-stress-response-in-plants
#6
Qing Liu, Shijuan Yan, Tifeng Yang, Shaohong Zhang, Yue-Qin Chen, Bin Liu
Due to global climate change, temperature stress has become one of the primary causes of crop losses worldwide. Much progress has been made in unraveling the complex stress response mechanisms in plants, particularly in the identification of temperature stress responsive protein-coding genes. Recently discovered microRNAs (miRNAs) and endogenous small-interfering RNAs (siRNAs) have also been demonstrated as important players in plant temperature stress response. Using high-throughput sequencing, many small RNAs, especially miRNAs, have been identified to be triggered by cold or heat...
July 21, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28708312/arabidopsis-cpr5-regulates-ethylene-signaling-via-molecular-association-with-the-etr1-receptor
#7
Feifei Wang, Lijuan Wang, Longfei Qiao, Jiacai Chen, Maria Belen Pappa, Haixia Pei, Tao Zhang, Caren Chang, Chun-Hai Dong
The plant hormone ethylene plays various functions in plant growth, development and response to environmental stress. Ethylene is perceived by membrane-bound ethylene receptors, and among the homologous receptors in Arabidopsis, the ETR1 ethylene receptor plays a major role. The present study provides evidence demonstrating that Arabidopsis CPR5 functions as a novel ETR1 receptor-interacting protein in regulating ethylene response and signaling. Yeast split ubiquitin assays and bi-fluorescence complementation studies in plant cells indicated that CPR5 directly interacts with the ETR1 receptor...
July 14, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28695640/seed-dispersal-by-hornets-an-unusual-insect-plant-mutualism
#8
LETTER
Gao Chen, Zheng-Wei Wang, Yan Qin, Wei-Bang Sun
Vespicochory, seed dispersal by hornets, is a rare seed dispersal mechanism in angiosperms, and to date there are few records of this phenomenon. Through field investigations and behavioural assays conducted in four populations of Stemona tuberosa from 2011-2016, we demonstrate that hornets are the primary seed dispersers of S. tuberosa and play an important role in "long-distance" seed dispersal in this species. Furthermore, some ant species act as secondary dispersers and may transport the seeds to safe sites...
July 11, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28681564/arr12-promotes-de-novo-shoot-regeneration-in-arabidopsis-thaliana-via-activation-of-wuschel-expression
#9
Xuehuan Dai, Zhenhua Liu, Meng Qiao, Juan Li, Shuo Li, Fengning Xiang
Auxin and cytokinin direct cell proliferation and differentiation during the in vitro culture of plant cells, but the molecular basis of these processes, especially de novo shoot regeneration, has not been fully elucidated. Here, we describe the regulatory control of shoot regeneration in Arabidopsis thaliana (L.) Heynh, based on the interaction of ARABIDOPSIS RESPONSE REGULATOR12 (ARR12) and WUSCHEL (WUS). The major site of ARR12 expression coincided with the location where the shoot apical meristem (SAM) initiated...
July 5, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28650091/localized-micronutrient-patches-induce-lateral-root-foraging-and-chemotropism-in-nicotiana-attenuate
#10
Abigail P Ferrieri, Ricardo A R Machado, Carla C M Arce, Danny Kessler, Ian T Baldwin, Matthias Erb
Nutrients are distributed unevenly in the soil. Phenotypic plasticity in root growth and proliferation may enable plants to cope with this variation and effectively forage for essential nutrients. However, how micronutrients shape root architecture of plants in their natural environments is poorly understood. We employed a combination of field and laboratory-based assays to determine the capacity of Nicotiana attenuata to direct root growth towards localized nutrient patches in its native environment. Plants growing in nature displayed a particular root phenotype consisting of a single primary root and a few long, shallow lateral roots...
June 26, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28646554/theseus1-positively-modulates-plant-defense-responses-against-botrytis-cinerea-through-guanine-exchange-factor4-signaling
#11
LETTER
Shaofeng Qu, Xi Zhang, Yutong Song, Jinxing Lin, Xiaoyi Shan
The plant cell wall is an important interface for sensing pathogen attack and activating signaling pathways that promote plant immune responses. THESEUS1 (THE1) acts as a sensor of cell wall integrity that controls cell elongation during plant growth. However, no specific role for THE1 in plant defense responses has been reported. Here, we found that THE1 interacts with GUANINE EXCHANGE FACTOR4 (GEF4) and that both proteins play regulatory roles in plant resistance to the necrotrophic fungus Botrytis cinerea (B...
June 24, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28636095/suppression-or-knockout-of-saf-sam-overcomes-the-sa-mediated-hybrid-male-sterility-in-rice
#12
Yongyao Xie, Baixiao Niu, Yunming Long, Gousi Li, Jintao Tang, Yaling Zhang, Ding Ren, Yao-Guang Liu, Letian Chen
Hybrids between the indica and japonica subspecies of rice (Oryza sativa) are usually sterile, which hinders utilization of heterosis in the inter-subspecific hybrid breeding. The complex locus Sa comprises two adjacently located genes, SaF and SaM, which interact to cause abortion of pollen grains carrying the japonica allele in japonica-indica hybrids. Here we showed that silencing of SaF or SaM by RNA interference restored male fertility in indica-japonica hybrids with heterozygous Sa. We further used CRISPR/Cas9-based genome editing to knockout the SaF and SaM alleles respectively of an indica rice line to create hybrid-compatible lines...
June 21, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28636077/arabidopsis-shaker-pollen-inward-k-channel-spik-functions-in-snrk1-complex-regulated-pollen-hydration-on-the-stigma
#13
Dan-Dan Li, Huan Guan, Fei Li, Chang-Zhen Liu, Yu-Xiu Dong, Xian-Sheng Zhang, Xin-Qi Gao
Pollen hydration is a critical step that determines pollen germination on stigma. KINβγ is a plant-specific subunit of the SNF1-related protein kinase 1 complex (SnRK1 complex). In pollen of the Arabidopsis kinβγ mutant, the levels of reactive oxygen species (ROS) were decreased which lead to compromised hydration of the mutant pollen on stigma. In this study, we analyzed gene expression in kinβγ mutant pollen by RNA-seq and found the expression of inward shaker K(+) channel SPIK was down-regulated in the kinβγ pollen...
June 21, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28631407/zygote-arrest-3-that-encodes-the-trna-ligase-is-essential-for-zygote-division-in-arabidopsis
#14
Ke-Jin Yang, Lei Guo, Xiu-Li Hou, Hua-Qin Gong, Chun-Ming Liu
In sexual organisms, division of the zygote initiates a new life cycle. Although several genes involved in zygote division are known in plants, how the zygote is activated to start embryogenesis remains elusive. Here, we showed that a mutation in ZYGOTE-ARREST 3 (ZYG3) in Arabidopsis led to a tight zygote-lethal phenotype. Map-based cloning revealed that ZYG3 encodes the tRNA ligase AtRNL, which is a single-copy gene in the Arabidopsis genome. Expression analyses showed that AtRNL is expressed throughout zygotic embryogenesis, and in meristematic tissues...
June 20, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28623850/arabidopsis-tor-signaling-is-essential-for-sugar-regulated-callus-formation
#15
LETTER
Kyounghee Lee, Pil Joon Seo
Dedifferentiation is a remarkable process that produces pluripotent stem cells from differentiated somatic cells to ensure developmental plasticity. Plants have evolved the ability of cellular dedifferentiation, and signaling cascades related to auxin and cytokinin-dependent callus formation have been extensively investigated. However, the molecular mechanism underlying sugar-dependent callus formation remains unknown. Here, we found that sugar-dependent callus formation is mainly regulated by the TOR-E2Fa module in Arabidopsis...
June 17, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28600834/engineering-crop-nutrient-efficiency-for-sustainable-agriculture
#16
REVIEW
Liyu Chen, Hong Liao
Increasing crop yields can provide food, animal feed, bioenergy feedstocks, and biomaterials to meet increasing global demand; however, the methods used to increase yield can negatively affect sustainability. For example, application of excess fertilizer can generate and maintain high yields but also increases input costs and contributes to environmental damage through eutrophication, soil acidification, and air pollution. Improving crop nutrient efficiency can improve agricultural sustainability by increasing yield while decreasing input costs and harmful environmental effects...
June 10, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28598543/mutation-in-a-novel-gene-small-and-cordate-leaf-1-affects-leaf-morhology-in-cucumber
#17
LETTER
Dongli Gao, Chunzhi Zhang, Shu Zhang, Bowen Hu, Shenhao Wang, Zhonghua Zhang, Sanwen Huang
Plant species exhibit substantial variation in leaf morphology. We isolated a recessive mutant gene termed small and cordate leaf 1 (scl1) that causes alteration in both leaf size and shape of cucumber. Compared to wild type leaves, scl1 mutant had less number of epidermal pavement cells. A single nucleotide polymorphism was associated with the leaf phenotype, which occurred in a putative nucleoside bisphosphate phosphatase. RNA-seq analysis of the wild type and scl1 mutant leaves suggested that SCL1 regulation may not involve known hormonal pathways...
June 9, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28574161/osidd2-a-zinc-finger-and-indeterminate-domain-protein-regulates-secondary-cell-wall-formation-fa
#18
Peng Huang, Hideki Yoshida, Kenji Yano, Shunsuke Kinoshita, Kyosuke Kawai, Eriko Koketsu, Masako Hattori, Sayaka Takehara, Ji Huang, Ko Hirano, Reynante Lacsamana Ordonio, Makoto Matsuoka, Miyako Ueguchi-Tanaka
Previously, we found 123 transcription factors (TFs) as candidate regulators of secondary cell wall (SCW) formation in rice by using phylogenetic and co-expression network analyses. Among them, we examined in this work the role of OsIDD2, a zinc finger and indeterminate domain (IDD) family TF. Its overexpressors showed dwarfism, fragile leaves, and decreased lignin content, which are typical phenotypes of plants defective in SCW formation, whereas its knockout plants showed slightly increased lignin content...
June 2, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28544342/arabidopsis-ddaptor-protein-1g-is-critical-for-pollen-development
#19
LETTER
Chong Feng, Jia-Gang Wang, Hai-Hong Liu, Sha Li, Yan Zhang
Pollen development is a pre-requisite for sexual reproduction of angiosperms, during which various cellular activities are involved. Pollen development accompanies dynamic remodeling of vacuoles through fission and fusion, disruption of which often compromises pollen viability. We previously reported that the Y subunit of adaptor protein 1 (AP1G) mediates synergid degeneration during pollen tube reception. Here, we demonstrate that AP1G is essential for pollen development. AP1G loss-of-function resulted in male gametophytic lethality due to defective pollen development...
May 24, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28544763/hp30-2-a-mitochondrial-prat-protein-for-import-of-signal-sequence-less-precursor-proteins-in-arabidopsis-thaliana
#20
Claudia Rossig, John Gray, Oscar Valdes, Sachin Rustgi, Diter von Wettstein, Christiane Reinbothe, Steffen Reinbothe
Chloroplasts and mitochondria contain a family of putative preprotein and amino acid transporters designated PRAT. Here, we analyzed the role of two previously characterized PRAT protein family members, encoded by At3g49560 (HP30) and At5g24650 (HP30-2), in planta using a combination of genetic, cell biological and biochemical approaches. Expression studies and green fluorescent protein tagging identified HP30-2 both in chloroplasts and mitochondria, whereas HP30 was located exclusively in chloroplasts. Biochemical evidence was obtained for an association of mitochondrial HP30-2 with two distinct protein complexes, one containing the inner membrane translocase TIM22 and the other containing an alternative NAD(P)H dehydrogenase subunit (NDC1) implicated in a respiratory complex 1-like electron transport chain...
August 2017: Journal of Integrative Plant Biology
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