大豆花荚期抗旱性的鉴定与综合评价

选用10个不同生态类型的大豆新品种,通过盆栽试验和大田试验,测定其与抗旱性有关的生理生化指标,如相对电导率、光合速率、叶片相对含水量等,运用灰色多维综合评估方法,以抗旱指数为参考数列,确定各项指标性状与大豆花荚期抗旱性的关系并对10个大豆品种花荚期抗旱性进行评价。结果表明,参试品种"晋大74"与构造的参考品种关联度最大,为0.8706,抗旱性最好;"晋大53"关联度为0.7278,抗旱性次之;"晋大75"关联度为0.5513,抗旱性最弱。从抗旱指数和灰色多维综合评估法两种方法可知,"晋大74"和"晋大53"的抗旱性最好,评价结果与大田生产实际相符。两种方法对大豆品种抗旱性评价的相关系数r为0.8061**,灰色多维综合评估法在大豆花荚期评价抗旱性是可靠的。

Comprehensive evaluation of flowering-podding period drought resistance of soybean

Ten different ecotypes of soybean varieties were selected based on the degree of drought resistance.Some physiological and biochemical indexes related to drought resistance including relative conductivity,photosynthetic rate,relative water content,etc.were measured by way of pot and field experiments.Grey system theory was used to determine the relationship between indexes and drought resistance.Then by applying grey correlative degree,comprehensive multiple target evaluation and drought resistance index as parameters,every identified index was assigned an absolute value to quantitatively evaluate soybean drought-resistance in flowering-podding period.Results show the relative degrees of "Jinda 74","Jinda 53","Jinda 75"with the reference variety to be,respectively,0.8706,0.7278 and 0.5513."Jinda 74"has the highest drought resistance,followed by"Jinda 53",while "Jinda75" is simply the weakest.In accordance with drought-resistant index theory and grey correlative degree of comprehensive multiple target evaluation,drought resistance of"Jinda 74"and"Jinda 53"are the best,which well correspond with practical situations.Correlation coefficient of the two drought resistance appraisal methods of soybean is 0.8061**,which explains the reliability of grey correlative degree in the use of comprehensive multiple target evaluation to evaluate soybean drought resistance in flowering-podding period.