High temperature and water deficit may reduce seed number in field pea purely by decreasing plant growth rate
High temperature and water deficit may reduce seed number in field pea purely by decreasing plant growth rate
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DOI：
10.1071/fp03105
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发表时间：
2003-01-01
影响因子：
3
通讯作者：
Lecoeur, J
中科院分区：
文献类型：
--
作者：
Guilioni, L;Wéry, J;Lecoeur, J
种子数是豆科作物产量中最易变化的组成部分，受热胁迫和水分亏缺的影响很大。本文的目的是调查是否HS和WD减少种子数量在田间豌豆通过其对生物量生产的负面影响，而不是通过特定的影响，对发展中的生殖器官。在法国南部进行了几个田间和温室实验，其中HS和/或WD的各种强度，持续时间和植物生命周期中的位置施加在几个豌豆品种。WD和HS以强度依赖的方式减少种子数量。它们还改变了种子沿茎沿着的分布。植物进行WD和温和的HS有更多的种子的基础phytomers比对照植物，从而有可能排除种子发育的压力的直接影响。相反，严重的HS导致生殖器官立即流产。水分胁迫和高温胁迫也降低了净光合速率（P-n），但仅在胁迫期间。建立了土壤水分状况和叶温与土壤磷氮含量的定量关系。然而，在所有情况下，有一个单一的线性关系，最终的种子数量和植物生长速率在种子集的关键时期（从开花开始到种子填充的最后一个种子轴承phytomer开始）。这反映了豌豆的生殖可塑性，它调节生殖库的数量，与植物中同化物的可用性保持明显的平衡。
Seed number, the most variable yield component of legumes is strongly affected by heat stress (HS) and water deficit (WD). The objective of this paper is to investigate whether HS and WD reduced seed number in field pea through their negative effects on biomass production rather than by specific effects on the developing reproductive organs. Several field and glasshouse experiments were carried out in southern France, in which HS and/or WD of various intensities, durations and positions in the plant lifecycle were imposed on several pea cultivars. WD and HS reduced seed number, in an intensity-dependent manner. They also changed the distribution of seeds along the stem. Plants subjected to WD and mild HS had more seeds on the basal phytomers than did control plants, making it possible to exclude direct effects of stress on seed development. In contrast, severe HS resulted in the immediate abortion of reproductive organs. WD and HS also decreased net photosynthesis (P-n), but only during the period of constraint. Quantitative relationships between P-n and soil water status and between P-n and leaf temperature were established. Nevertheless, in all cases there was a single linear relationship between final seed number and plant growth rate during the critical period for seed set (from the beginning of flowering to the beginning of seed fill for the last seed-bearing phytomer). This reflects the reproductive plasticity of pea, which adjusts the number of reproductive sinks in an apparent balance with assimilate availability in the plant.