Open AccessTAC4 controls tiller angle by regulating the endogenous auxin content and distribution in rice
Author(s) -
Li Hua,
Sun Hongying,
Jiang Jiahuang,
Sun Xianyou,
Tan Lubin,
Sun Chuanqing
Publication year - 2021
Publication title -
plant biotechnology journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.525
H-Index - 115
eISSN - 1467-7652
pISSN - 1467-7644
DOI - 10.1111/pbi.13440
Subject(s) - tiller (botany) , biology , oryza sativa , auxin , gravitropism , cultivar , limiting , agronomy , botany , gene , genetics , arabidopsis , mutant , mechanical engineering , engineering
Tiller angle, an important component of plant architecture, greatly influences the grain yield of rice ( Oryza sativa L.). Here, we identified Tiller Angle Control 4 ( TAC4 ) as a novel regulator of rice tiller angle. TAC4 encodes a plant‐specific, highly conserved nuclear protein. The loss of TAC4 function leads to a significant increase in the tiller angle. TAC4 can regulate rice shoot gravitropism by increasing the indole acetic acid content and affecting the auxin distribution. A sequence analysis revealed that TAC4 has undergone a bottleneck and become fixed in indica cultivars during domestication and improvement. Our findings facilitate an increased understanding of the regulatory mechanisms of tiller angle and also provide a potential gene resource for the improvement of rice plant architecture.