Genetic Analysis of Semidwarfness and Grain Shattering of Chinese Rice Variety “Ai-Jio-Nan-Te”

Abstract

In order to clarify the inheritance of the semidwarfness of a Chinese variety Ai-Jio-Nan-Te (AJNT), two semidwarf near-isogenic lines of a variety Norin 29, SC-AJNT and SC-TN1, were developed through recurrent backcrosses. SC-AJNT exhibited the semidwarfness and shattering habit derived from the donor parent AJNT, while SC-TN1 exhibited the semidwarfness of a variety Taichung (Native) 1, which was proved to be controlled by the semidwarfing gene sd-1. SC-TN1, as well as Norin 29, showed non-shattering habit. The genetic analysis of culm length in the cross of SC-AJNT/Norin 29 demonstrated clearly that the semidwarfness of AJNT is controlled by a single recessive gene. Allelism test between the semidwarfing genes of SC-AJNT and that of SC-TN1 revealed that AJNT has a semidwarfing gene at the same locus as that of sd-1. The shattering habit of SC-AJNT was found to be controlled by a single recessive gene. The existence of a linkage relationship between the semidwarfing gene and recessive shattering gene was observed in the F₂ of the cross SC-AJNT/Norin 29 and BC₁ of the cross SC-AJNT/Norin 29//SC-AJNT. The recombination value was estimated 13.7±4.6%.