Natural variation in the regulation of leaf senescence and relation to N and root traits in wheat

Hebbar, K. B.; Rane, Jagadish; Ramana, S.; Panwar, N. R.; Singh, Ajay Pal; Rao, A. Subba; Prasad, P. V. Vara

doi:10.1007/s11104-013-2012-6

Cited by 20 publications

(17 citation statements)

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“…Leaf senescence is the final stage of leaf development in nature which is an important process for crop yield. Delaying leaf senescence and extending the duration of leaf photosynthesis during grain filling is a possible route for increasing grain yields (Gaju et al ., ; Hebbar et al ., ; Kichey et al ., ; Richards, ). Our current study found that transgenic expressing TaGS2‐2Ab prolonged leaf functional duration (Figure c–f), providing strong leaf metabolic basis for the increased grain yield and TGW.…”

Section: Discussionmentioning

confidence: 97%

Transgenic expression of plastidic glutamine synthetase increases nitrogen uptake and yield in wheat

Zhao

Liu

et al. 2018

Plant Biotechnology Journal

110

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SummaryThe plastidic glutamine synthetase isoform (GS2) plays a key role in nitrogen (N) assimilation. We introduced TaGS2‐2Abpro::TaGS2‐2Ab, the favourable allele of TaGS2‐2A in the winter wheat (Triticum aestivum) variety Ji5265. Transgenic expression of TaGS2‐2Ab significantly increased GS2 abundance and GS activity in leaves. Two consecutive field experiments showed the transgenic lines had higher grain yield, spike number, grain number per spike and 1000‐grain weight than did the wild type under both low N and high N conditions. Analysis of N use‐related traits showed that transgenic expression of TaGS2‐2Ab increased root ability to acquire N, N uptake before and after flowering, remobilization of N to grains and N harvest index. Measurement of chlorophyll content and net photosynthesis rate in flag leaves during grain filling stage revealed that the transgenic lines had prolonged leaf functional duration as compared with the wild type. These results suggest that TaGS2 plays important role in N use, and the favourable allele TaGS2‐2Ab is valuable in engineering wheat with improved N use efficiency and grain yield.

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Section: Discussionmentioning

confidence: 97%

Transgenic expression of plastidic glutamine synthetase increases nitrogen uptake and yield in wheat

Zhao

Liu

et al. 2018

Plant Biotechnology Journal

110

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“…It is reported previously that some root traits are directly related to grain yield of wheat, e.g., diameter of the roots, are directly related to harvest index and biomass at maturity (Richards and Passioura, 1989), seminal root number is strongly related to grain mass (Bengough et al, 2006) and shallow & deep root weight and root biomass are positively correlated with grain yield (Ehdaie et al, 2012). There is widespread evidence that root architecture and different root characteristics of many crop species varies among genotypes (Crush et al, 2007;Hebbar et al, 2014;O'Toole and Bland, 1987;Whalley et al, 2013). In a few quite recent studies the importance of studying root architectural traits has been emphasized for adaptation of the crop varieties to various abiotic stress conditions.…”

Section: Introductionmentioning

confidence: 99%

Genotypic variations in root traits of wheat varieties at phytomer level

Robin

Uddin

Afrin

et al. 2014

J Bangladesh Agric Univ

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The aims of this study were to investigate genotypic variations in root traits at phytomer level of wheat varieties and for recommending a few root traits as selection parameters in future breeding programs. Two separate experiments were conducted to measure their root traits for hydroponically grown wheat plants. In Experiment 1, main axis length, root hair density and diameter differed from phytomer to phytomer at 60 days after sowing for two varieties, Shotabdi and Sonalika. Density of first order laterals at their axis of origin, dry weights of roots and shoots and root:shoot ratio varied significantly among 8 varieties. In Experiment 2, number of root bearing phytomer, total number of adventitious roots, main axis length at root bearing phytomer 1 and 2 (youngest roots were the reference point and numbered as phytomer 1), length of first order laterals at phytomer 3, root hair density and dry weights of roots and shoots were significantly different among varieties. PC1 (principal component 1) resulted in significant variation among varieties for number of live leaves, new roots appeared, number of root bearing phytomer, total number of adventitious roots, root dry weight and shoot dry weight. PC2 yielded significant difference among varieties for live leaves, main axes length at phytomer 1 & 2, number of new roots, root hair density and diameter. Selection of varieties based on main axes length at the youngest phytomer & root hair density per unit surface area along with dry weights of roots and shoots could be recommended for future breeding program as these four parameters consistently resulted in significant variation among varieties. DOI: http://dx.doi.org/10.3329/jbau.v12i1.21238 J. Bangladesh Agril. Univ. 12(1): 45-54, June 2014

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“…The original results of our study throw a new light on the regulation of N remobilization and definition of senescence in plants submitted to abiotic stress, such as heat-stress. At moderate temperatures senescence is linked to N remobilization to filling seeds, a mechanism to compensate the limitation of N uptake by roots (Hebbar et al, 2014). On the other hand, this research established that the heat-induced senescence (noticeable through the reduction of seed-filling duration) is surprisingly not associated with an acceleration of N nutrient remobilization to filling seeds.…”

Section: Definition Of Plant Senescence Under Heat Stress and Strategmentioning

confidence: 75%

“…In most grain crops and, above all, in legumes, newly acquired N is generally low and insufficient to fulfill the high N demand of seeds, consequently endogenous N previously accumulated in vegetative parts is exported to seeds (Sinclair and Wit, 1976;Salon et al, 2001;Malagoli et al, 2005;Schiltz et al, 2005;Kichey et al, 2007;Barraclough et al, 2014). This remobilized N derives from the proteolysis of essential leaf proteins involved in photosynthesis, mostly Rubisco (Gregersen et al, 2008;Masclaux-Daubresse et al, 2008). The resulting decrease in leaf photosynthetic capacity may thus limit yield by shortening the duration of the seed-filling period (Sinclair and Horie, 1989;Munier-Jolain et al, 2008;Bueckert et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

High Temperatures During the Seed-Filling Period Decrease Seed Nitrogen Amount in Pea (Pisum sativum L.): Evidence for a Sink Limitation

Larmure

Munier-Jolain

2019

Front. Plant Sci.

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Higher temperatures induced by the ongoing climate change are a major cause of yield reduction in legumes. Pea (Pisum sativum L.) is an important annual legume crop grown in temperate regions for its high seed nitrogen (N) concentration. In addition to yield, seed N amount at harvest is a crucial characteristic because pea seeds are a source of protein in animal and human nutrition. However, there is little knowledge on the impacts of high temperatures on plant N partitioning determining seed N amount. Therefore, this study investigates the response of seed dry matter and N fluxes at the whole-plant level (plant N uptake, partitioning in vegetative organs, remobilization, and accumulation in seeds) to a range of air temperature (from 18.4 to 33.2°C) during the seed-filling-period. As pea is a legume crop, plants relying on two different N nutrition pathways were grown in glasshouse: N 2-fixing plants or NO 3 −-assimilating plants. Labeled nitrate (15 NO 3 −) and intra-plant N budgets were used to quantify N fluxes. High temperatures decreased seed-filling duration (by 0.8 day per°C), seed dry-matter and N accumulation rates (respectively by 0.8 and 0.032 mg seed −1 day −1 per°C), and N remobilization from vegetative organs to seeds (by 0.053 mg seed −1 day −1 per°C). Plant N 2-fixation decreased with temperatures, while plant NO 3 − assimilation increased. However, the additional plant N uptake in NO 3 −-assimilating plants was never allocated to seeds and a significant quantity of N was still available at maturity in vegetative organs, whatever the plant N nutrition pathway. Thus, we concluded that seed N accumulation under high temperatures is sink limited related to a shorter seed-filling duration and a reduced seed dry-matter accumulation rate. Consequently, sustaining seed sink demand and preserving photosynthetic capacity of stressed plants during the seed-filling period should be promising strategies to promote N allocation to seeds from vegetative parts and thus to maintain crop N production under exacerbated abiotic constraints in field due to the ongoing climate change.

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Natural variation in the regulation of leaf senescence and relation to N and root traits in wheat

Cited by 20 publications

References 43 publications

Transgenic expression of plastidic glutamine synthetase increases nitrogen uptake and yield in wheat

Transgenic expression of plastidic glutamine synthetase increases nitrogen uptake and yield in wheat

Genotypic variations in root traits of wheat varieties at phytomer level

High Temperatures During the Seed-Filling Period Decrease Seed Nitrogen Amount in Pea (Pisum sativum L.): Evidence for a Sink Limitation

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