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Journal of Integrative Plant Biology

Dirk Joldersma, Zhongchi Liu
Plant transformation has for many years relied on agrobacterium infection or biolistic particle delivery. However, these two methods are limited to model plant systems or a small number of crop species. This commentary highlights recent development in the nanoparticle-mediated transformation that has the potential to revolutionize how plants are transformed.
February 27, 2018: Journal of Integrative Plant Biology
Matthew Zinkgraf, Suzanne Gerttula, Shutang Zhao, Vladimir Filkov, AndrewLi Groover
Plants modify development in response to external stimuli, to produce new growth that is appropriate for environmental conditions. For example, gravi-stimulation of leaning branches in angiosperm trees results in modifications of wood development, to produce tension wood that pulls leaning stems upright. Here, we use gravi-stimulation and tension wood response to dissect the temporal changes in gene expression underlying wood formation in Populus stems. Using time-series analysis of 7 time points over a 14-day experiment, we identified 8919 genes that were differentially expressed between tension wood (upper) and opposite wood (lower) sides of leaning stems...
February 26, 2018: Journal of Integrative Plant Biology
Pengfei Jiang, Shiliang Wang, Aziz Ul Ikram, Zuntao Xu, Haiyang Jiang, Beijiu Cheng, Yong Ding
H3K4me3 plays important roles in development, transcription, and environmental responses. Here we report that SDG721 (SET-domain group protein 721) and SDG705 are involved in regulating rice development. SDG721 and SDG705 encode TRITHORAX-like proteins, which appear to modulate H3K4 methylation levels. Loss of SDG721 and SDG705 function resulted in GA-deficient phenotypes, including semi-dwarfism, reduced cell length, and reduced panicle branching. The transcripts levels and H3K4me3 levels of GA biosynthesis genes and GA signaling pathway genes were downregulated in the sdg721 sdg705 plants...
February 23, 2018: Journal of Integrative Plant Biology
Lei Guo, Li Jiang, Xiu-Li Lu, Chun-Ming Liu
Although it is known that in most angiosperms mitosis in early endosperm development is syncytial and synchronized, it is unclear how the synchronization is regulated. We showed previously that APC11, also named ZYG1, in Arabidopsis activates zygote division by interaction and degradation of cyclin B1. Here, we report that the mutation in APC11/ZGY1 led to unsynchronized mitosis and over-accumulation of cyclin B1-GUS in endosperms. Mutations in other two APC subunits showed similar defects. Transgenic expression of stable cyclin B1 in endosperms also caused unsynchronized mitosis...
February 9, 2018: Journal of Integrative Plant Biology
Min Diao, Xiaolu Qu, Shanjin Huang
Calcium (Ca2+ ) signaling has been implicated in pollen germination and pollen tube growth. To date, however, we still know very little about how exactly Ca2+ signaling links to various physiological subcellular processes during pollen germination and pollen tube growth. Given that Ca2+ signaling is tightly related to the cytosolic concentration and dynamics of Ca2+ , it is vital to trace the dynamic changes in Ca2+ levels in order to decode Ca2+ signaling. Here we found that G-CaMP5 serves well as an indicator for monitoring cytosolic Ca2+ dynamics in pollen cells...
February 9, 2018: Journal of Integrative Plant Biology
Jiaqiang Dong, Hai Huang
The leaves of higher plants are polar along their adaxial-abaxial axis, and the development of the adaxial domain (upper side) and the abaxial domain (lower side) makes the leaf a highly efficient photosynthetic organ. It has been proposed that a hypothetical signal transported from the shoot apical meristem (SAM) to the incipient leaf primordium, or conversely, the plant hormone auxin transported from the leaf primordium to the SAM, initiates leaf adaxial-abaxial patterning. This hypothetical signal has been referred to as the Sussex signal, because the research of Ian Sussex published in 1951 was the first to imply its existence...
February 6, 2018: Journal of Integrative Plant Biology
Jun-Bo He, Xian-Hai Zhao, Ping-Zhou Du, Wei Zeng, Cherie T Beahan, Yu-Qi Wang, Hui-Ling Li, Antony Bacic, Ai-Min Wu
Xylan is the major plant hemicellulosic polysaccharide in the secondary cell wall. The transcription factor KNOTTED-LIKE HOMEOBOX OF ARABIDOPSIS THALIANA 7 (KNAT7) regulates secondary cell wall biosynthesis, but its exact role in regulating xylan biosynthesis remains unclear. Using transactivation analyses, we demonstrate that KNAT7 activates the promoters of the xylan biosynthetic genes, IRREGULAR XYLEM 9 (IRX9), IRX10, IRREGULAR XYLEM 14-LIKE (IRX14L), and FRAGILE FIBER 8 (FRA8). The knat7 T-DNA insertion mutants have thinner vessel element walls and xylary fibers, and thicker interfascicular fiber walls in inflorescence stems, relative to wild-type (WT)...
February 2, 2018: Journal of Integrative Plant Biology
Xiang Zhao, Qing-Ping Zhao, Chun-Ye Xu, Jin Wang, Jin-Dong Zhu, Bao-Shuan Shang, Xiao Zhang
Two redundant blue-light receptors known as phototropins (phot1 and phot2) influence a variety of physiological responses, including phototropism, chloroplast positioning, and stomatal opening in Arabidopsis thaliana. Whereas phot1 functions in both low- and high-intensity blue light (HBL), phot2 functions primarily in HBL. Here, we aimed to elucidate phot2-specific functions by screening for HBL-insensitive mutants among mutagenized Arabidopsis phot1 mutants. One of the resulting phot2 signaling associated(p2sa) double mutants, phot1 p2sa2, exhibited phototropic defects that could be restored by constitutively expressing NON-PHOTOTROPIC HYPOCOTYL 3 (NPH3), indicating that P2SA2 was allelic to NPH3...
February 2, 2018: Journal of Integrative Plant Biology
Tess R Scavuzzo-Duggan, Arielle M Chaves, Abhishek Singh, Latsavongsakda Sethaphong, Erin Slabaugh, Yaroslava G Yingling, Candace H Haigler, Alison W Roberts
Cellulose synthases (CESAs) are glycosyltransferases that catalyze formation of cellulose microfibrils in plant cell walls. Seed plant CESA isoforms cluster in six phylogenetic clades, whose non-interchangeable members play distinct roles within Cellulose Synthesis Complexes (CSCs). A 'class specific region' (CSR) with higher sequence similarity within vs. between functional CESA classes has been suggested to contribute to specific activities or interactions of different isoforms. We investigated CESA isoform specificity in the moss Physcomitrella patens (Hedw...
January 30, 2018: Journal of Integrative Plant Biology
Miao Li, Xin Wang, Changxing Li, Hanxia Li, Junhong Zhang, Zhibiao Ye
GRAS family transcription factors are involved in multiple biological processes in plants. Here, we report that GRAS2 plays a vital role in regulating fruit weight in tomato (Solanum lycopersicum). We found that the expression of GRAS2 was elevated in ovaries and maintained at a constant level in fertilized ovules. Reduction of GRAS2 expression in transgenic plants reduced fruit weight through modulating ovary growth and cell size. At the metabolic level, down-regulation of GRAS2 decreased the activities of the gibberellic acid biosynthesis and signal transduction pathways, leading to insufficient levels of active gibberellic acid during the initial ovary development of tomato...
January 23, 2018: Journal of Integrative Plant Biology
Jiawei Pan, Dahui Huang, Zhonglong Guo, Zheng Kuang, He Zhang, Xinyu Xie, Zengfeng Ma, Shaopei Gao, Manuel T Lerdau, Chengcai Chu, Lei Li
The ability of a plant to produce grain, fruit, or forage depends ultimately on photosynthesis. There have been few attempts, however, to study microRNAs, which are a class of endogenous small RNAs post-transcriptionally programming gene expression, in relation to photosynthetic traits. We focused on miR408, one of the most conserved plant miRNAs, and overexpressed it in parallel in Arabidopsis, tobacco, and rice. The transgenic plants all exhibited increased copper content in the chloroplast, elevated abundance of plastocyanin, and an induction of photosynthetic genes...
January 13, 2018: Journal of Integrative Plant Biology
Chengkai Lu, Jinfeng Qi, Christian Hettenhausen, Yunting Lei, Jingxiong Zhang, Mou Zhang, Cuiping Zhang, Juan Song, Jing Li, Guoyan Cao, Saif Ul Malook, Jianqiang Wu
Atmospheric CO2 levels are rapidly increasing due to human activities. However, the effects of elevated CO2 (ECO2 ) on plant defense against insects and the underlying mechanisms remain poorly understood. Here we show that ECO2 increased the photosynthetic rates and the biomass of tobacco and rice plants, and the chewing lepidopteran insects Spodoptera litura and Mythimna separata gained less and more mass on tobacco and rice plants, respectively. Consistently, under ECO2 , the levels of jasmonic acid (JA), the main phytohormone controlling plant defense against these lepidopteran insects, as well as the main defense-related metabolites, were increased and decreased in insect-damaged tobacco and rice plants...
January 10, 2018: Journal of Integrative Plant Biology
Lei He, Sen Zhang, Zhennan Qiu, Juan Zhao, Wendan Nie, Haiyan Lin, Zhengge Zhu, Dali Zeng, Qian Qian, Li Zhu
Chloroplast genes are transcribed by the PEP or NEP. FRUCTOKINASE-LIKE PROTEINS (FLNs) are phosphofructokinase-B (PfkB)-type carbohydrate kinases that act as part of the PEP complex; however, the molecular mechanisms underlying FLNs activity in rice remain elusive. Previously, we identified and characterized a heat-stress sensitive albino (hsa1) mutant in rice. Map-based cloning revealed that HSA1 encodes a putative OsFLN2. Here, we further demonstrated that knockdown or knockout of the OsFLN1, a close homolog of HSA1/OsFLN2, considerably inhibits chloroplast biogenesis and the fln1 knockout mutants created by CRISPR/Cas9 exhibit severe albino phenotype and seedling lethality...
January 10, 2018: Journal of Integrative Plant Biology
Minliang Jin, Xiangguo Liu, Wei Jia, Haijun Liu, Wenqiang Li, Yong Peng, Yanfang Du, Yuebin Wang, Yuejia Yin, Xuehai Zhang, Qing Liu, Min Deng, Nan Li, Xiyan Cui, Dongyun Hao, Jianbing Yan
Flowering time is a trait vital to the adaptation of flowering plants to different environments. Here, we report that CCT domain genes play an important role in flowering in maize (Zea mays L.). Among the 53 CCT family genes we identified in maize, 28 were located in flowering time quantitative trait locus regions and 15 were significantly associated with flowering time based on candidate-gene association mapping analysis. Furthermore, a CCT gene named ZmCOL3 was shown to be a repressor of flowering. Overexpressing ZmCOL3 delayed flowering time by approximately 4 days, in either long-day or short-day conditions...
January 10, 2018: Journal of Integrative Plant Biology
Jin-Xing Zhou, Zhang-Wei Liu, Yong-Qiang Li, Lin Li, Bangjun Wang, She Chen, Xin-Jian He
LHP1 mediates recruitment of the PRC2 histone methyltransferase complex to chromatin and thereby facilitates maintenance of H3K27me3 on FLC, a key flowering repressor gene. Here, we found that the PWWP domain proteins (PDPs) interact with FVE and MSI5 to suppress FLC expression and thereby promote flowering. We demonstrated that FVE, MSI5, and PDP3 were co-purified with LHP1. The H3K27me3 level on FLC was decreased in the pdp mutants as well as in the fve/msi5 double mutant. This study suggests that PDPs function together with FVE and MSI5 to regulate the function of the PRC2 complex on FLC...
January 4, 2018: Journal of Integrative Plant Biology
Qian Qian
Rice is one of the most important staple cereals, feeds over 60% of China's population and contributes nearly 40% of the nation's total calorie intake (Chen et al. 2007). A continuous increase in rice production is required to meet the demands of increasing population and food consumption (Tilman et al. 2011).
January 4, 2018: Journal of Integrative Plant Biology
Wenting Peng, Weiwei Wu, Junchu Peng, Jiaojiao Li, Yan Lin, Yanan Wang, Jiang Tian, Lili Sun, Cuiyue Liang, Hong Liao
A potential mechanism to enhance utilization of sparingly soluble forms of phosphorus (P) is the root secretion of malate, which is mainly mediated by the ALMT gene family in plants. In this study, a total of 34 GmALMT genes were identified in the soybean genome. Expression patterns diverged considerably among GmALMTs in response to phosphate (Pi) starvation in leaves, roots and flowers, with expression altered by P availability in 26 of the 34 GmALMTs. One root-specific GmALMT whose expression was significantly enhanced by Pi-starvation, GmALMT5, was studied in more detail to determine its possible role in soybean P nutrition...
March 2018: Journal of Integrative Plant Biology
Xiurong Zhang, Suqing Zhu, Kun Zhang, Yongshan Wan, Fengzhen Liu, Qingfang Sun, Yingjie Li
Breeding programs aim to improve the yield and quality of peanut (Arachis hypogaea L.); using association mapping to identify genetic markers linked to these quantitative traits could facilitate selection efficiency. A peanut association panel was established consisting of 268 lines with extensive phenotypic and genetic variation, meeting the requirements for association analysis. These lines were grown over 3 years and the key agronomic traits, including protein and oil content were examined. Population structure (Q) analysis showed two subpopulations and clustering analysis was consistent with Q-based membership assignment and closely related to botanical type...
March 2018: Journal of Integrative Plant Biology
Xiaoliang Shi, Sunlu Chen, Yu Peng, Yufeng Wang, Jiugeng Chen, Zhanghua Hu, Baohe Wang, Aihong Li, Daiyin Chao, Yuhong Li, Sheng Teng
Since its domestication from wild rice thousands of years ago, rice has been cultivated largely through transplantation. During transplantation from the nursery to the paddy field, rice seedlings experience transplantation shock which affects their physiology and production. However, the mechanisms underlying transplantation shock and rice adaptation to this shock are largely unknown. Here, we isolated a transplant-sensitive chloroplast-deficient (tsc1) rice mutant that produces albino leaves after transplantation...
February 2018: Journal of Integrative Plant Biology
Xiao-Bo Zhang, Bao-Hua Feng, Hui-Mei Wang, Xia Xu, Yong-Feng Shi, Yan He, Zheng Chen, Atul Prakash Sathe, Lei Shi, Jian-Li Wu
We previously reported a spotted-leaf mutant pelota (originally termed HM47) in rice displaying arrested growth and enhanced resistance to multiple races of Xanthomonas oryzae pv. oryzae. Here, we report the map-based cloning of the causal gene OsPELOTA (originally termed splHM47 ). We identified a single base substitution from T to A at position 556 in the coding sequence of OsPELOTA, effectively mutating phenylalanine to isoleucine at position 186 in the translated protein sequence. Both functional complementation and over-expression could rescue the spotted-leaf phenotype...
February 2018: Journal of Integrative Plant Biology
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