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以来源于不同地区的12个西瓜基因型为试材,采用盆栽控水的方式进行持续干旱处理,研究干旱胁迫对西瓜幼苗株高、根长、鲜质量及干物质积累等生长状况的影响,比较不同基因型材料对干旱胁迫的生理响应差异,同时依据旱害指数对其抗旱性进行直接评价,并采用隶属函数法进一步验证和综合评价.结果表明:干旱处理下,12个西瓜基因型对干旱胁迫的耐受能力存在明显差异,各基因型开始出现旱害症状的时间和发生旱害的程度各不相同.干旱胁迫降低了西瓜幼苗的株高、地上、地下鲜质量和地上干物质积累量,普遍提高了根冠比,而对根长和地下干质量存在正向和负向两种不同的影响.干旱处理后,西瓜叶片的相对含水量和叶绿素含量均不同程度降低,丙二醛、过氧化氢和超氧阴离子含量增加,脯氨酸大量积累,而可溶性蛋白含量以及抗氧化酶活性则因基因型的不同而表现出不同的结果.分析认为,3个野生型材料M20、KY-3和Y-2为抗旱性强的西瓜种质,Y34、金美人和04-1-2为敏感种质,而其余基因型为中抗种质.
Twelve watermelon genotypes from different regions were used as experimental materials and potted water was used for continuous drought treatment to study the effects of drought stress on plant height, root length, fresh weight and dry matter accumulation of watermelon seedlings. The physiological responses of different genotypes to drought stress were compared, and the drought resistance was directly evaluated according to the drought index, and the membership function was used to further validate and evaluate the drought resistance.The results showed that 12 watermelon genotypes Drought stress tolerance was significantly different, the onset of drought symptoms of each genotype of the time and degree of occurrence of drought vary.Drought stress reduces the watermelon seedling height, aboveground and underground fresh weight and aboveground dry matter accumulation , The root and shoot ratio were generally increased, while there were two positive and negative effects on the root length and underground dry weight.When drought treatment, the relative water content and chlorophyll content of watermelon leaves were reduced to varying degrees, malondialdehyde , Hydrogen peroxide and superoxide anion content increased, proline accumulation, and soluble protein content and antioxidant enzyme activity due to different genotypes The results showed that the three wild-type materials M20, KY-3 and Y-2 were resistant to watermelon germplasm, Y34, Golden Delicious and 04-1-2, while the other genes Type for the resistance of germplasm.