Preliminary Evaluation on Introgression Lines Derived from DJY1 as Recurrent Parent in Response to Soil Low Nitrogen

Abstract

In order to screen the tolerance to low nitrogen germplasms and to apply them into Japonica rice production in the high plateau zone, and it will be helpful to increase production efficiency and protect the environment. A total of 2064 introgression lines derived from Dianjingyou1, an improved and released variety in Yunnan high plateau zone as recurrent parent, were grown under two different soil nitrogen contents. They were evaluated in tolerance to low nitrogen by using SPAD value as criterion. The results showed that SPAD mean values of the introgression line used showed normal distributions under both the two different soil nitrogen contents. Significant positive correlations were found between SPAD mean value and either effective panicle number or spike per panicle. Two introgression lines derived from Khazar (BC 3 F 3 ) or Chhomrong (BC 3 F 4 ) as donor parent, were preliminarily selected as low-nitrogen tolerant germplasms based on their SPAD mean values greater than the 95% critical value in the one-tailed test. Six introgression lines derived from one among Basmati370 (BC 3 F 3 ), Type3 (BC 3 F 3 ), KholeMavshi (BC 3 F 3 ), Ajaya (BC 3 F 3 ), Doddi (BC 3 F 3 ) and Yuqiugu (BC 4 F 3 ) as donor parent were primarily considered as sensitive germplasm to low nitrogen based on their SPAD mean values less than the 5% critical value in the one-tailed test. The introgression lines we got could be applied into breeding for tolerance to low nitrogen or nitrogen high efficiency in Japonica production in the high plateau zone in the future.