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首页> 外文期刊>Journal of Agronomy and Crop Science/Zeitschrift fur acker-und pflanzenbau >Heat stress affects floral morphology, silique set and seed quality in chamber and field grown winter canola
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Heat stress affects floral morphology, silique set and seed quality in chamber and field grown winter canola

机译：热应力影响室内和田间冬季油菜的花卉形态，硅砂套和种子质量

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The impact of heat stress coinciding with reproductive stages in winter canola was studied using walk-in controlled environment chambers and field-based tents. Six different cultivars (46W94, Edimax CL, Mercedes, Popular, DKW44-10 and DKW46-15) were used in both the experiments following a split-plot design. Under controlled environment chambers, all six cultivars were exposed to HDT (day/night; 34/15 degrees C), HNT (23/20 degrees C), HDNT (34/20 degrees C) and control (23/15 degrees C) conditions for 14 days coinciding with flowering. Under field conditions, custom built 'heat tents' were used to impose heat stress starting seven days after 50% of flowering till maturity. The results demonstrated that HDT and HDNT induced significant impact on floral morphology, extreme levels of floral sterility and complete yield loss with two weeks of stress exposure during flowering. However, biomass, seed weight and oil concentration at maturity were either significantly increased or unchanged which demonstrated significant post-stress phenotypic plasticity in canola to overcome damage caused by short episode of HDT and HDNT during flowering. The long duration heat stress under field conditions recorded significant decrease in yield parameters and oil concentration in the canola cultivars. Incorporating greater post-stress phenotypic plasticity will help develop canola as an ideal alternative crop under future climates associated with enhanced frequency of short heat stress episodes coinciding with critical reproductive stages.
机译：利用步入式控制环境室和野外帐篷，研究了与冬季油菜繁殖期相吻合的热应激对油菜生长的影响。采用裂区设计，在两个试验中使用了六个不同的品种（46W94、Edimax CL、梅赛德斯、大众、DKW44-10和DKW46-15）。在受控环境室中，所有六个品种在开花时同时暴露于HDT（白天/夜间；34/15摄氏度）、HNT（23/20摄氏度）、HDNT（34/20摄氏度）和对照（23/15摄氏度）条件下14天。在田间条件下，使用定制的“热帐篷”从50%开花后7天开始施加热应激，直至成熟。结果表明，HDT和HDNT在开花期间两周的胁迫暴露下对花的形态、极端不育水平和完全产量损失产生了显著影响。然而，生物量、种子重量和成熟时的油浓度显著增加或保持不变，这表明油菜在逆境后表现出显著的表型可塑性，以克服开花期间短暂的HDT和HDNT造成的损害。大田条件下的长期热胁迫显著降低了油菜品种的产量参数和含油量。结合更大的胁迫后表型可塑性将有助于使油菜在未来气候条件下成为一种理想的替代作物，这种气候条件下，短时间的热应激发作频率会增加，与关键生殖阶段相吻合。

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