Abstract:

To screen out new candidate rapeseed varieties suitable for production in South China region,field trail data of fourteen early-mature rapeseed new varieties in China's regional trial was first analyzed by AMMI models,and then the relationship between G×E interaction and climate factors in eight experimental sites were investigated by GGE biplot method. Then biomass and photosynthetic parameters during wintering were also investigated in a representative variety. This analysis allowed a deeper understanding of the influence of climate factors and physiology on yield formation,by which new varieties with better adaptation can be identified and used in agricultural production. The results showed that the mean yield of 14 varieties varied markedly,with S0013 ranking the highest(2 191.021 kg/ha)and 282081 the lowest (1 328.512 kg/ha, only 60% of the previous one). Combined ANOVA indicated that the majority of variation was from the environment effect(82.27%)and the least from the genotype effect(4.93%). Moreover,variation from genotype×environment interaction(G×E)was also very significant,although it only accounted for 10.17% of total variation,most of which(92.63%)could be further dissected by AMMI model. It seemed that yielding ability was mainly affected by climate factor such as rainfall,while yield stability was largely determined by temperature. For yield stability,the fourteen varieties were ranked,from high to low,as Qianza ZW9001>Qianza J9002>C868>05V11>Qianza J9001>WB203>Chuanza 09NH014>S0013>Yunyouza No.2>Za 1613>08SH60>282081>Ronghua 906>131(CK). Among these,S0013,C868 and WB203 had the highest yield,while 282081 the lowest. The discriminating power for experimental sites were listed,in descending order as Yuxi>Baoshan>Ji'an>Nanchang(Yichun)>Guilin>Changsha>Anshun. Moreover,the biomass of YG131 during wintering was the highest in Guilin. Meanwhile,photosynthetic parameters such as Pn,Tr and Ci were also high and positively correlated with plot yield,suggesting that active photosynthesis promote yield formation. Taken together,the comprehensive evaluation of field performance for new rapeseed varieties in Chinese national field trial through AMMI model and GGE biplot can provide valuable information for the breeding of early maturing rapeseed varieties and the selection of idea experimental sites.

Key words: Rapeseed, G×E interaction, AMMI model, GGE biplot, Regional trial, Climate factors