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为探讨以鼓粒速率作为大豆耐旱性评价指标,采用盆栽试验,先以汾豆65和中作3088为试验材料,在鼓粒期设置干旱胁迫(短期)和正常灌水(对照)处理,测定大豆荚果厚度变化,并用新建的方法对7个大豆材料的鼓粒期耐旱性进行初步比较。结果表明:大豆鼓粒期遭遇短期干旱胁迫,处理期鼓粒速率明显下降甚至停滞,复水后出现快速鼓粒现象(补偿效应),但后续鼓粒速率明显低于对照处理。中作3088适应干旱胁迫的能力优于汾豆65。在同等鉴定条件下,耐旱性较好的大豆材料表现为延迟萎蔫、胁迫期鼓粒速率较高、复水后鼓粒速率能较好恢复等特征。通过平均抗旱系数和隶属函数值综合评定,鲁96150、邯豆5号和秦豆11号鼓粒期耐旱性较强,中黄35和秦豆8号鼓粒期耐旱性一般,而汾豆65和中黄30鼓粒期耐旱性较弱。综上所述,大豆受旱后以荚果厚度表示的鼓粒速率发生明显变化,可用于大豆鼓粒期耐旱性的评价。
In order to explore the drum speed as the evaluation index of soybean drought tolerance, a pot experiment was conducted. The experimental data of Fen-deng 65 and Zhong-zuo 3088 were used to set up the drought stress (short-term) and normal irrigation (control) Soybean pod thickness changes, and a preliminary comparison of the drought tolerance of the seven soybean materials drum stage grain by a new method. The results showed that under the condition of short-term drought stress, the druming rate of soybean was significantly decreased or even stagnated at the stage of druming, and the rapid drumming phenomenon (compensation effect) occurred after rehydration, but the subsequent druming rate was significantly lower than that of the control treatment. The ability of 3088 to adapt to drought stress is better than Fen bean 65. Under the same identification conditions, the better drought-tolerant soybean materials were characterized by delayed wilting, higher druming rate during stress period, better recovery of drum velocity after rehydration. Through the comprehensive evaluation of the average drought resistance coefficient and membership function value, the drought tolerance at the boll stage of Lu 96150, Handan 5 and Qindou 11 is strong, and the drought resistance at drum stage of Zhonghuang 35 and Qindou 8 is normal, Drought tolerance of beans 65 and Zhonghuang 30 was weaker. In conclusion, the drum rate, which is expressed as the pod thickness after soybean drought, changes obviously, and can be used to evaluate the drought tolerance of soybean during the grain-filling stage.