Acta Agriculturae Boreali-Sinica ›› 2025, Vol. 40 ›› Issue (6): 100-109. doi: 10.7668/hbnxb.20195781

Special Issue: Oil crops Cultivation & Physiology

• Tillage & Cultivation·Physiology & Biochemistry • Previous Articles     Next Articles

Identification and Analysis of Cold Resistant Advantageous Traits of Winter Rapeseed in Northern Arid and Cold Regions

GUAN Mingwei, GUO Anqiang, LI Heping, ZHAI Lanju, LI Jiming, LI Aiguo   

  1. Institute of Dry Farming,Hebei Academy of Agriculture and Forestry Sciences,Key Lab of Crop Drought Tolerance Research of Hebei Province,Hengshui 053000,China
  • Received:2025-05-16 Published:2025-12-31

Abstract:

To explore the disparities in overwintering rates and yields between Brassica napus L.and Brassica rapa L.in the cold and arid regions of the north,as well as to examine the correlation between diverse agronomic traits,yield,and cold resistance-enhancing traits,it utilized 45 B.napus L.and 22 B.rapa L.varieties as subjects.It conducted a statistical analysis of their overwintering rates,average yields and agronomic traits.It also studied seeding density experiments with B.napus L.and B.rapa L.varieties that exhibited similar yield levels,compared root traits between B.napus L.and B.rapa L..The results indicated that among the 67 varieties tested,the average overwintering rate of B.rapa L.(97.59%) was significantly higher than that of B.napus L.(65.87%).The average yield potential of B.napus L.was higher than that of B.rapa L..For B.rapa L.,which was capable of stable overwintering,increasing the seeding density significantly elevated the number of effective plants but did not augment the average yield.Conversely,for B.napus L.,its lower overwintering rate constrained the increase in the number of effective plants,thereby limiting the average yield.B.napus L.with a high overwintering rate exhibited agronomic traits such as higher branching positions and angular density,fewer secondary branches,total branches,and effective siliques per plant after overwintering.Comparison of root traits between B.napus L.and B.rapa L.showed that enlarged root systems,short hypocotyls,and growth points positioned below the ground surface were advantageous traits contributing to the robust cold resistance of B.rapa L..It proposes that breeding density-tolerance B.napus L.with root traits akin to those of B.rapa L.and with growth points situated below the ground surface represents a pivotal breeding direction for enhancing the overwintering rate of B.napus L.,fostering increased rapeseed yield,and ensuring oil supply stability.

Key words: Rapeseed, Correlation analysis, Overwintering rate, Agronomic traits, Yield

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Cite this article

GUAN Mingwei, GUO Anqiang, LI Heping, ZHAI Lanju, LI Jiming, LI Aiguo. Identification and Analysis of Cold Resistant Advantageous Traits of Winter Rapeseed in Northern Arid and Cold Regions[J]. Acta Agriculturae Boreali-Sinica, 2025, 40(6): 100-109. doi: 10.7668/hbnxb.20195781.

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