旱稻抗旱性鉴定方法与指标研究——全生育期抗旱性鉴定

Study on drought-resistance identification methods and evaluation index of dry-land rice ——Ⅲ Experiment of drought-resistance evaluation of whole growth period

用干旱棚法,对11个旱稻品种抗旱性进行了研究,分析了株高、穗长、穗下节、抽穗期、成产三因素、结实率、叶片失水率、叶片萎蔫度等性状在水分胁迫条件下的变化及与品种抗旱性的关系。结果表明:利用产量的抗旱指数作为评价旱稻抗旱性是科学的、准确的,并用其对试验品种的抗旱性进行了定性分级;结合隶属函数法评价了其它生育指标与抗旱性强弱的关系,相对株高与抗旱系数呈极显著相关性,相对结实率、叶片萎蔫度(抽穗期)和相对穗粒数与抗旱系数呈显著相关性,抽穗期和相对穗下节长与抗旱系数相关性密切,其它性状与旱稻抗旱性没有明显的相关性。

By using rain shelter, the drought-resistance of 11 dry-land rice varieties was studied in accordance with the changes of plant height, ear length, top stem length, heading date, yield components, seed setting rate, water losing rate and withering degree under water stress and non-stress conditions. The results showed that the drought-resistance index was reliable for the evaluation and classification of drought-resistance of dry-land rice. The relationships between drought-resistance and the growing parameters were analyzed by using subordinate function method. It was discovered that there existed a close relationship between drought-resistance and plant height, seed setting rate, leaf withering index, grains per ear, heading date and top stem length, but no relationship between drought-resistance and other characters.