Nitrogen partitioning and remobilization in relation to leaf senescence, grain yield and grain nitrogen concentration in wheat cultivars
Nitrogen partitioning and remobilization in relation to leaf senescence, grain yield and grain nitrogen concentration in wheat cultivars
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DOI：
10.1016/j.fcr.2013.09.003
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发表时间：
2014-01-01
影响因子：
5.8
通讯作者：
Foulkes, M. John
中科院分区：
文献类型：
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作者：
Gaju, Oorbessy;Allard, Vincent;Foulkes, M. John
本研究的目的是研究英国和法国高氮低氮条件下16个小麦品种籽粒开花后氮素积累、分配和再动员遗传变异的决定因素，以及籽粒旗叶衰老、籽粒产量和籽粒N%的关系。总体而言，各品种花期叶片氮素积累量在低低温条件下为5.32 ~ 8.03 gN m(-2)，在低低温条件下为2.69 ~ 3.62 gN m(-2)，在低低温条件下为5.45 ~ 7.25 gN m(-2)，在低低温条件下为2.55 ~ 3.41 gN m(-2) （P < 0.001）。不同品种花期叶面氮素分配指数（地上氮素占作物成分的比例）在低海拔地区为037 ~ 0.42，低海拔地区为0.34 ~ 0.40；茎叶鞘在低温下和低温下分别为0.39 ~ 0.43和0.35 ~ 0.41 （P < 0.001）。在所有试验中，不同品种花后叶面氮素再调动量与花后旗叶衰老持续时间呈负相关。总的来说，很难将花期层氮再动员的遗传差异与层氮积累的遗传差异分开。在高氮条件和轻度氮胁迫下，籽粒产量和籽粒N%的遗传变异（通过N稀释效应）似乎主要受花前N积累而非花后N再动员的影响（Sutton Bonington LN）。当氮素胁迫增加时（克莱蒙费朗LN），有证据表明，籽粒氮素再动员是籽粒氮素遗传变异的决定因素，但不是籽粒产量的决定因素。本研究结果表明，选择花期层氮积累和花期后层氮再动员对优化小麦衰老持续时间、提高籽粒产量、氮素利用效率和籽粒氮素百分比具有一定的育种价值。(C) 2013年作者。Elsevier B.V.版权所有。
Our objective was to investigate the determinants of genetic variation in N accumulation, N partitioning and N remobilization to the grain post-flowering and associations with flag-leaf senescence, grain yield and grain N% in 16 wheat cultivars grown under high N (HN) and low N (LN) conditions in the UK and France. Overall, cultivars ranged in leaf lamina N accumulation at anthesis from 5.32 to 8.03 gN m(-2) at HN and from 2.69 to 3.62 gN m(-2) at LN, and for the stem-and leaf-sheath from 5.45 to 7.25 gN m(-2) at HN and from 2.55 to 3.41 gN m(-2) at LN (P < 0.001). Cultivars ranged in N partitioning index (proportion of above-ground N in the crop component) at anthesis for the leaf lamina from 037 to 0.42 at HN and 0.34 to 0.40 at LN; and for the stem-and leaf-sheath from 0.39 to 0.43 at HN and from 0.35 to 0.41 at LN (P < 0.001). The amount of leaf lamina N remobilized post-anthesis was negatively associated with the duration of post-anthesis flag-leaf senescence amongst cultivars in all experiments under HN. In general, it was difficult to separate genetic differences in lamina N remobilization from those in lamina N accumulation at anthesis. Genetic variation in grain yield and grain N% (through N dilution effects) appeared to be mainly influenced by pre-anthesis N accumulation rather than post-anthesis N remobilization under high N conditions and under milder N stress (Sutton Bonington LN). Where N stress was increased (Clermont Ferrand LN), there was some evidence that lamina N remobilization was a determinant of genetic variation in grain N% although not of grain yield. Our results suggested that selection for lamina N accumulation at anthesis and lamina N remobilization post-anthesis may have value in breeding programmes aimed at optimizing senescence duration and improving grain yield, N-use efficiency and grain N% of wheat. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.