胡麻种质资源成株期抗旱性评价

【目的】了解不同类型胡麻种质的成株期抗旱性表现,挖掘抗旱基因资源,为抗旱育种提供科技支撑。【方法】在年降雨量不足40mm的敦煌市,设干旱胁迫和正常灌水2个处理进行试验研究,考查与抗旱性相关的7个农艺性状,采用综合抗旱系数与隶属函数相结合的方法,对其抗旱性进行综合评价。【结果】被考查的农艺性状对干旱胁迫的反应程度各异,其中株高和千粒重迟钝,单株粒数和单株粒重敏感;根据抗旱性量度值(D值)的聚类结果,将供试种质划分为5级,其中1级抗旱型2份、2级22份、3级69份、4级72份、5级27份;供试种质的抗旱性强弱与其地理来源、选育条件和利用生境息息相关。【结论】选择多个农艺性状,采用综合抗旱系数与隶属函数相结合的方法,综合评估胡麻成株期抗旱性是可行的,不仅可以避免单一指标的片面性和不稳定性,而且可以较好地揭示指标性状与抗旱性的关系。

Drought-Resistance Evaluation of Flax Germplasm at Adult Plant Stage

【Objective】 The main purpose of this paper was to study the performance of different types of flax germplasms at adult plant stage, explore gene resource, and give science-technology support in breeding under drought conditions. 【Method】Drought Resistance Coefficient (DC) and Subordinate Function Coefficients (SC) were used to evaluate the drought tolerance in rainfed and water irrigation treatments in Dunhuang city where the annual precipitation is less than 40 mm, and meanwhile 7 agronomic traits which are relevant to drought-resistance were studied. 【Result】 The result of study on agronomic traits indicated that drought-tolerance had different reaction degrees, that plant height and 1000-grain weight were blunt while kernel number and grain weight per spike were sensitive. According to drought-resistance value clustering analysis, flax germplasm used in this study were divided into 5 drought resistance grades, 2 belonged to grade 1, 22 belonged to grade 2, 69 belonged to grade 3, 72 belonged to grade 4, and 27 belonged to grade 5. The capacity of drought resistance of the tested cultivars was relevant to geographical origins and breeding conditions and local surrounding. 【Conclusion】 Using several agronomic traits, it is an effective way to comprehensively evaluate the drought tolerance of flax at adult plant stage by Drought Resistance Coefficient (DC) and Subordinate Function Coefficients (SC), not only the bias and the instability of single factor analysis can be avoided, but the relationship between different drought tolerance and indexes in flax can be reflected better.