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为了探索不同生育阶段盐分胁迫下棉花的水分调节机制,采用筒栽试验,研究了不同矿化度咸水(NaCl)灌溉对不同生育阶段棉花“冀棉616”生长指标和一些水分生理指标的短期影响。结果表明:当灌溉水矿化度达到4 g·L-1后就会抑制棉花营养生长,但较少影响生殖生长(蕾期和花铃期);盐分胁迫没有影响棉花蕾期生育进程,但推迟了苗期生育进程,并有促进提前吐絮的作用;随灌溉水矿化度的增加,不同生育阶段棉花叶片的气孔阻力均呈递增趋势,而叶绿素相对含量在苗期时呈递增趋势、蕾期时呈先增后减趋势、花铃期呈递减趋势;盐分胁迫显著增大了调查时期内除叶片以外所有器官的干鲜比,而叶片干鲜比基本稳定;盐胁迫下,棉花具有优先供给叶片水分和降低叶片蒸腾耗水的水分调节机制。
In order to explore the mechanism of water regulation under different salt stress in cotton, tube experiments were conducted to study the effects of different salt water salinity (NaCl) irrigation on the growth index and some water physiological indexes of cotton “Jimian 616” at different growth stages. Short-term impact. The results showed that when the salinity of irrigation water reached 4 g · L-1, the vegetative growth of cotton was inhibited, but the reproductive growth was less affected (bud stage and flowering stage); salt stress did not affect the bud stage of cotton, Delayed the development of seedling stage and promoted the early bolting. With the increase of salinity of irrigation water, the stomatal resistance of cotton leaves showed an increasing trend at different growth stages, while the relative content of chlorophyll showed an increasing trend at seedling stage. The trend was first increased and then decreased, and the flowering period showed a decreasing trend. Under salt stress, the dry-fresh ratio of all organs except leaves was significantly increased during the survey period, while the dry-fresh ratio of leaves was basically stable. Under salt stress, cotton had the priority Moisture regulation mechanisms that supply leaf moisture and reduce water consumption for leaf transpiration.