Previously, we mapped the qSPP7 QTL affecting the number of spikelets per panicle (SPP) on rice chromosome 7 using near-isogenic line (NIL WH29001) derived from an interspecific cross between the japonica ‘Hwaseong’ and Oryza minuta. In the present study, we confirmed this QTL using progeny derived from a cross between IL102, a WH29001 sister line and Hwaseong. Genetic analysis determined that qSPP7 was located between a KASP marker KJ07–049 and RM21605. The O. minuta segment on chromosome 7 introgressed into the Hwaseong background was associated with an increase in SPP. The panicle structure of IL102 revealed that not only the number of SPP increased significantly, but also the number of branches per panicle increased as compared to Hwaseong suggesting that the donor allele of qSPP7 promotes branching in the genetic background of Hwaseong. Linkage analysis indicated that qEhd1 on chromosome 10 is involved in the difference in heading date of IL102 and Hwaseong. Experiments under 3 different day length conditions revealed that IL102 always showed earlier heading and higher SPP as compared to Hwaseong indicating that the effect of qSPP7 in the Hwaseong background was not dependent on photoperiod, and SPP increased in proportion to the number of days to heading.

Citations

Citations to this article as recorded by  

• Assessment of mutant rice genotypes on growth cycle length and response to reduced water availability
  Luis Herminio Chairez Tejeda, Raymond Joseph, Eduardo Venske, Viviane Kopp da Luz, Andrés Eloy Chacón-Ortiz, Ariano Martins de Magalhães Júnior, Luciano Carlos da Maia, Antonio Costa de Oliveira, Camila Pegoraro
  Scientia Agricola.2024;[Epub]     CrossRef
• Molecular Breeding of Zheyou810, an Indica–Japonica Hybrid Rice Variety with Superior Quality and High Yield
  Jian Song, Yongtao Cui, Honghuan Fan, Liqun Tang, Jianjun Wang
  Agriculture.2023; 13(9): 1807.     CrossRef
• Genetic Structure and Geographical Differentiation of Traditional Rice (Oryza sativa L.) from Northern Vietnam
  Ngoc Ha Luong, Le-Hung Linh, Kyu-Chan Shim, Cheryl Adeva, Hyun-Sook Lee, Sang-Nag Ahn
  Plants.2021; 10(10): 2094.     CrossRef