14份新麦草种质材料苗期抗旱性差异

Difference of Drought Resistance among 14 Psathyrostachys juncea Accessions at Seedling Stage

采用温室模拟干旱胁迫-复水方法,对14份新麦草种质材料苗期的叶片相对含水量、叶绿素的SPAD值、相对电导率、丙二醛和脯氨酸含量等5个抗旱生理指标进行了测定,综合评价其抗旱性能。采用欧氏距离法进行聚类分析,将14份新麦草种质材料的抗旱性划分为3个级别,相对抗旱的材料包括XMC01、XMC06、XMC10、XMC11,中度抗旱的包括XMC02、XMC04、XMC08、XMC09、XMC12、XMC13,相对敏感的包括XMC03、XMC05、XMC07、XMC14。

The drought resistance of 14 accessions of Psathyrostachys juncea （Fisch.）Nevski at seedling stage was comprehensively identified and evaluated using the simulated drought stress and rewatering method in greenhouse. The morphological and physiological indexes were measured and analyzed. The re sults showed that ： as the stress of drought was intensified , the relative water content of leaves and the SPAD values of chlorophyll were decreased ; meanwhile , the relative electrical conductivity rate , content of MDA and free proline accumulation were increased. After rewatering , the values of measured indexes were recovered at the different degrees. With cluster analysis, 14 P. juncea accessions were divided into three grades of the drought resistance, e. g. the stronger drought resistant germplasm including XMC01, XMC06, XMC10, XMC11; the medium drought resistant germplasm including XMC02, XMC04, XMC08, XMC09, XMC12, XMC13; and the weaker drought resistant germplasm including XMC03, XMC05, XMC07, XMC14.