低温对小麦种子萌发和幼苗生长的影响_张泽全.pdfVIP

西 南 农 业 学 报 2010 23 1 22 Southwest China JournalofAgricultural Sciences Vol123 No1 1 : 1001- 4829( 2010) 01- 0022- 04 1, 2 3 1, 2 1, 2 2 2 1 2* 张泽全 , 舒长生 , 董雪芳 ,赖运平 ,李 俊,魏会廷 ,彭正松 , 杨武云 ( 1., 637002; 2., 610066; 3. , 644007) : 以 3 个小麦品种为实验材料, 在室温( 18e )和低温(4 e )胁迫下测定发芽特性和幼苗(萌发 15 d)形态指 , 以各性状低 温与室温下测定值的比值(相对值)作为小麦耐低温评价指 , 评价小麦萌发和幼苗的耐低温特性结果表明: 低温降低小麦发 芽速度和阻碍幼苗生长, 苗比根对低温敏感, 低温的干鲜比大于室温的干鲜重比值; 种子萌发和幼苗期的各性状相对值可以作为 鉴定小麦耐低温的评价指 : 小麦; 低温; 发芽指数; 幼苗生长 : S512. 1 : A Effect of Low Temperature on Seed Germ ination and Seedling Growth inW heat 1, 2 3 1, 2 1, 2 2 2 1 2* ZHANG Ze-quan , SHU Chang-sheng, DONG Xue-fang , LAIYun-ping , LI Jun , WEIHui-ting , PENG Zheng-song ,YANGWu-yun ( 1. Life Science College, ChinaW est NormalUniversity, Sichuan Nanchong637002, China; 2. Crop Research Institute, Sichuan Academy ofAgricultural Sciences, Sichuan Chengdu 610066, China; 3. Yibin No. 4MiddleSchool, Sichuan Yibin 644007, China ) A bstract: Taking 3wheatvarieties asmaterals, the characteristicsof germination andmorphological index of seedling were determ ined. The ratio of themeasured valueoftraitsat room temperature( 18e ) and low temperature(4 e )wastaken as the evaluation index of low tempera- ture tolerance to evaluate the low temperature tolerance ofwheat seedling. The results showed that the low temperaturedecreased the germ-i nation speed and hindered the seedling growth. The seedling had stronger sensitive to the low temperature than thatof the root. The ratio