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在年降雨量不足40 mm的敦煌市,对我国不同地区育成的56份糜子品种,采用反复干旱法进行了苗期抗旱性鉴定,利用反复干旱存活率和抗旱性综合评价值D的聚类结果筛选出一级抗旱品种4份,分别是陇糜5号、吉3、蒙粳糜1号和蒙粳糜7号;配对t测验显示:反复干旱胁迫后糜子苗高、植株含水量、单株叶面积、生物学产量分别降低了16.097 cm、0.393 g/株、10.358 cm2/株、0.075 g/株,差异达到了极显著水平,而根长、相对生长率反向增加了0.555 cm、3.213%;主成分分析中,植株含水量、生物学产量、单株叶面积3个指标在第1主成分中起决定作用(系数均≥0.881),且与两种抗旱评价参数值相关性均达到了极显著水平,因此,确定植株含水量、生物学产量、单株叶面积作为糜子苗期抗旱性鉴定1级指标。
In Dunhuang city, the annual rainfall of less than 40 mm, 56 varieties of millet cultivated in different regions of our country were tested for drought resistance by using repeated drought method. Based on the clustering results of the comprehensive evaluation value D of repeated drought survival rate and drought resistance, Four drought-resistant cultivars were screened, namely Longmi 5, Ji 3, Mengjingmi 1 and Mengjingmi 7; Paired-t test showed that after repeated drought stress, the seedling height, plant water content, The leaf area and biological yield decreased by 16.097 cm, 0.393 g / plant, 10.358 cm2 / plant and 0.075 g / plant, respectively. The root length and relative growth rate increased by 0.555 cm and 3.213% In the principal component analysis, three indexes of plant water content, biological yield and leaf area of a plant play a decisive role in the first principal component (coefficient≥0.881), and the correlation with the two drought-resistant evaluation parameters Extremely significant level, therefore, to determine the water content of plants, biological yield, leaf area per plant as a candidate for the assessment of drought resistance of the first grade indicators.