Identification of Drought Tolerance of Sweet Sorghum at Booting Stage

doi:10.13560/j.cnki.biotech.bull.1985.2019-0391

Abstract

Abstract: The objective of this work is to select drought-tolerant sweet sorghum varieties at booting stage and their identification indexes. Total 28 sweet sorghum varieties were selected and 15 indexes such as plant height（PH）,stem diameter（SD）,leaf area（LA）,plant water content（WPC）,relative chlorophyll content（SPAD）,cell membrane permeability（CMP）,and photosynthetic rate（Pn）at booting stage were determined under normal irrigation（T1）and drought stress（T2）. Based on the drought tolerance coefficient of each index,the drought resistances of different sweet sorghum varieties at booting stage were comprehensively evaluated and classified by means of membership function,principal component analysis,and cluster analysis. Drought stress caused significant impact on all indexes,and the strong correlation analysis among 15 indexes existed. These 15 indexes were transformed into 6 new independent comprehensive indexes by principal component analysis,which represented the most of the original drought resistance information of all indexes. The D value of sweet sorghum of different varieties was calculated by membership function,and then 28 sweet sorghum varieties were divided into 4 categories by clustering analysis：category I consisting of 9 highly drought-resistant varieties,category II consisting of 10 drought-resistant varieties,category III consisting of 8 moderately drought-resistant varieties,and category IV consisting of one sensitive variety. Drought stress had an effect on all indexes of sweet sorghum at booting stage. Nine drought-resistant varieties were screened as following：F6036,F6080,F6099,F6043,F6149,F6059,F6096,F6271,and F6172.

Key words: sweet sorghum, booting stage, drought resistance, comprehensive evaluation, screening index

YUAN Chuang, XU Xing, TANG San-yuan, MAO Gui-lian, ZHU Lin. Identification of Drought Tolerance of Sweet Sorghum at Booting Stage[J]. Biotechnology Bulletin, 2019, 35(12): 1-9.

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