Chinese Journal OF Rice Science >
Breeding Potential of Rice TAC1 Gene for Tiller Angle
Received date: 2017-08-20
Revised date: 2017-10-11
Online published: 2017-11-10
【Objective】Rice tiller angle is an important plant-type trait. The appropriate tiller angle is generally a critical factor in developing ideal-type high-yielding rice variety. 【Methods】Effects of tiller angle controlling gene TAC1 on agronomic traits, sheath blight resistance, grain yield and quality were investigated under conditions of one-plant one-point and multi-plants one-point transplantation by using four pairs of near isogenic lines(NILs) at TAC1 gene.【Results】TAC1 increased rice tiller angle in all the genetic backgrounds tested, which is beneficial for reducing adverse impacts of sheath blight, without affecting other agronomical traits. Under high-yielding cultivation condition of multi-plant one-point transplantation, numbers of effective panicles in all the NILs with TAC1 were apparently higher than those of corresponding NILs with tac1. In the background of indica rice Teqing, the seed-setting rate, 1000-grain weight and plant yield of Teqing-TAC1 line were all higher than those of Teqing-tac1 line; however, the reverse results were obtained in the background of Lemont. In backgrounds of Wulingjing 1 and Zhendao 88, NILs with TAC1 gene displayed slightly grain yield than those with tac1 gene. The grain processing and appearance qualities of Teqing-TAC1 line were slightly improved compared to the corresponding control, while other TAC1-harboring NILs showed just the reverse with statistically insignificant difference. 【Conclusions】The indica rice with long leaf has a narrow range of appropriate tiller angles but for japonica rice with short leaf, the range is wider. Increasing rice tiller angle to an extent is beneficial for reducing sheath blight influence. TAC1 improves the plant type of japonica rice as well as the compact type indica rice.
Key words： tiller angle; ideal-type plant; sheath blight; grain yield
Zongxiang CHEN, Zhiming FENG, Longping WANG, Fan FENG, Yafang ZHANG, Yuyin MA, Xuebiao PAN, Shimin ZUO . Breeding Potential of Rice TAC1 Gene for Tiller Angle[J]. Chinese Journal OF Rice Science, 2017 , 31(6) : 590 -598 . DOI: 10.16819/j.1001-7216.2017.7100
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