Effects of cold stress on physiology and structure of watermelon seedling
WU Peng
GUO Qianqian
Abstract：In this study,'Jingxin No.1'and'Teda Lanhanwang'were used as materials which treated with low temperature of 5 ℃ for 0,3,6,9 d,and we analyzed watermelon seedling chilling index,fresh and dry weight of roots and root activity,and the fresh and dry weight,tissue water content,relative water content,water saturation deficit and photosynthetic pigment content of leaves.At the same time,the ultrastructural changes of leaves were observed by paraffin sections.The results showed that when under 5 ℃ chilling stress,the cold tolerance of'Teda Lanhanwang'was better than'Jingxin No.1'in 0-6 d,and there was no significant difference between them after 9 d.During the chilling stress,the dry and fresh weight ratio of leaves and roots of'Jingxin No.1'and'Teda Lanhanwang'decreased,and the saturated water deficit of leaves changed,and the content of photosynthetic pigment decreased.The total absorption area,the active absorption area and the percentage of active absorption percentage of'Teda Lanhanwang'root were more active than those of'Jingxin No.1'.The thickness of the upper epidermis and the lower epidermis of leaves decreased under chilling stress,and the ratio of palisade tissue and spongy tissue decreased.
Keywords：WatermelonChilling stressPhysiological indexUltrastructure
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 8-12 )