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- Title
Identification and selection of late sowing tolerant rapeseed (Brassica napus L.) accessions.
- Authors
LI Meng-qiong; ZHOU Yan; LUO Dan; WANG Li-hui; CHENG Yong; DING Xiao-yu; ZENG Liu; GAO Cheng-long; LAN Xing-jie; ZOU Xi-ling; LYU Yan
- Abstract
Short-growth-period rapeseed late sowing followed by low germination and seedling temperatures resulted in slow growth. Low temperature is one of the significant factors restricting the production of rapeseed (Brassica napus L.) in the Yangtze River basin, thus it is important to select new varieties of rapeseed that are tolerant to late sowing and has the trait of short-growth-period. In this study, 81 varieties of rapeseed were used as materials, and the effects of different low temperatures on seed germination period and seedling growth of oilseed rape were analyzed, with a view to screening late-sowing-tolerant short-growth-period materials. The results showed that low temperatures would lead to reduced seed germination rate, prolonged germination time, slowed down seedling growth, closed or reduced leaf stomata, and a significant decreased in the net photosynthetic rate of rapeseed. There was no significant correlation between traits at germination and seedling stage. Seed germination rate and shoot fresh weight significantly correlated with freezing survival rate at -2 to -6C, and the root system of rapeseed resources was sensitive to low temperatures at different levels. Though principle component analysis of the germination, net photosynthetic rate, freezing survival and total fresh weight occupied a relatively important position in the screening process of resources, which could be used as the main basis for evaluating late sowing tolerant rapeseed resources. 20 short-growth-period rapeseed resources were selected according to the comprehensive performance of each resource.
- Subjects
RAPESEED; SOWING; GERMINATION; PHOTOSYNTHETIC rates; LOW temperatures; WATERSHEDS
- Publication
Chinese Journal of Oil Crop Sciences, 2023, Vol 45, Issue 6, p1238
- ISSN
1007-9084
- Publication type
Article
- DOI
10.19802/j.issn.1007-9084.2023264