Faculty of Sustainability, Environmental and Life Sciences, Murdoch University, South Street, WA, Australia, 6150.
Molecular Plant Breeding CRC, Murdoch University, South Street, WA, Australia, 6150.
New Phytol. 2009 Mar;181(4):843-850. doi: 10.1111/j.1469-8137.2008.02713.x.
Terminal drought is a risk for wheat production in many parts of the world. Robust physiological traits for resilience would enhance the preselection of breeding lines in drought-prone areas. Three pot experiments were undertaken to characterize stem water-solublecarbohydrate (WSC), fructan exohydrolase expression, grain filling and leaf gas exchange in wheat (Triticum aestivum) varieties, Kauz and Westonia, which are considered to be drought-tolerant.Water deficit accelerated the remobilization of stem WSC in Westonia but not in Kauz. The profile of WSC accumulation and loss was negatively correlated with them RNA concentration of 1-FEH, especially 1-FEH w3 (1-FEH-6B). Under water deficit, Westonia showed lower concentrations of WSC than Kauz but did not show a corresponding drop in grain yield. The results from pot experiments suggest that stem WSC concentration is not, on its own, a reliable criterion to identify potential grain yield in wheat exposed to water deficits during grain filling. The expression of 1-FEH w3 may provide a better indicator when linked to osmotic potential and green leaf retention, and this requires validation in field-grown plants.
终端干旱是世界许多地区小麦生产的一个风险。具有弹性的强健生理特征将增强在易旱地区对育种系的预先选择。进行了三个盆栽实验，以描述在被认为耐旱的小麦（Triticum aestivum）品种 Kauz 和 Westonia 中的茎水溶性碳水化合物（WSC）、果聚糖外切酶表达、籽粒灌浆和叶片气体交换。水分亏缺加速了 Westonia 中茎 WSC 的再动员，但在 Kauz 中则没有。WSC 积累和损失的模式与 1-FEH，特别是 1-FEH w3（1-FEH-6B）的 RNA 浓度呈负相关。在水分亏缺下，Westonia 中的 WSC 浓度低于 Kauz，但籽粒产量并没有相应下降。盆栽实验的结果表明，在籽粒灌浆期间暴露于水分亏缺的小麦中，茎 WSC 浓度本身并不是识别潜在籽粒产量的可靠标准。当与渗透势和绿叶保留相关联时，1-FEH w3 的表达可能提供更好的指标，这需要在田间生长的植物中进行验证。
