The growth of vegetative and reproductive structures (leaves and silks) respond similarly to hydraulic cues in maize.
The growth of vegetative and reproductive structures (leaves and silks) respond similarly to hydraulic cues in maize.
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DOI：
10.1111/nph.14053
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
O. Turc;M. Bouteillé;Avan Fuad-Hassan;C. Welcker;F. Tardieu
中科院分区：
文献类型：
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作者：
O. Turc;M. Bouteillé;Avan Fuad-Hassan;C. Welcker;F. Tardieu
玉米（Zea mays）花的花柱和柱头（花丝）的伸长是快速的（1-3 mm h（-1）），在短时间内发生，并且在不利环境中的繁殖成功中起关键作用。在8个不同的蒸发需求和土壤水分状况的实验中，使用位移传感器在8个基因型的350株植物的蚕丝伸长率进行了测量。测定的时间进程表明，蚕丝伸长速率密切关注土壤水分状况和蒸发需求的变化，昼夜交替类似于叶片。昼夜交替陡峭，高比低植物蒸腾速率，通过蒸发需求或覆盖部分叶面积操纵。花丝伸长速率随蒸发量或土壤水分状况变化的半衰期为10-30 min，与叶片相似。丝伸长速率对木质部水势的敏感性与叶伸长速率的敏感性存在遗传联系。对于这些敏感性，线路差别很大。这些结果是一致的一个共同的液压控制膨胀生长在营养和生殖结构的环境条件的变化后，通过与木质部水势的密切联系。它们对育种、建模和表型分析具有重要意义。
The elongation of styles and stigma (silks) of maize (Zea mays) flowers is rapid (1-3 mm h(-1) ), occurs over a short period and plays a pivotal role in reproductive success in adverse environments. Silk elongation rate was measured using displacement transducers in 350 plants of eight genotypes during eight experiments with varying evaporative demand and soil water status. Measured time courses revealed that silk elongation rate closely followed changes in soil water status and evaporative demand, with day-night alternations similar to those in leaves. Day-night alternations were steeper with high than with low plant transpiration rate, manipulated via evaporative demand or by covering part of the leaf area. Half times of changes in silk elongation rate upon changes in evaporative demand or soil water status were 10-30 min, similar to those in leaves. The sensitivity of silk elongation rate to xylem water potential was genetically linked to that of leaf elongation rate. Lines greatly differed for these sensitivities. These results are consistent with a common hydraulic control of expansive growth in vegetative and reproductive structures upon changes in environmental conditions via a close connection with the xylem water potential. They have important implications for breeding, modelling and phenotyping.