Pleiotropism of the photoperiod-insensitive allele of Hd1 on heading date, plant height and yield traits in rice

Five populations segregated in isogenic backgrounds and three sets of near isogenic lines (NILs) overlapping in a 362.3-kb region covering heading date gene Hd1 were developed from the indica rice cross Zhenshan97 (ZS97)/Milyang 46 (MY46). They were used to analyze the effects of Hd1 on heading date...

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Bibliographic Details
Published in:PloS one 2012-12, Vol.7 (12), p.e52538-e52538
Main Authors: Zhang, Zhen-Hua, Wang, Kai, Guo, Liang, Zhu, Yu-Jun, Fan, Ye-Yang, Cheng, Shi-Hua, Zhuang, Jie-Yun
Format: Article
Language:English
Subjects:
Agriculture
Alleles
Analysis
Analysis of Variance
Biology
Breeding
Chromosomes
Cloning
Crop yield
Crop yields
Crosses, Genetic
Flowering
Genes
Genes, Plant - genetics
Genetic Markers
Genetic Pleiotropy
Genetics
Genomics
Genotype
Genotype & phenotype
Grain
Inbreeding
Oryza - anatomy & histology
Oryza - genetics
Oryza - growth & development
Oryza sativa indica
Photoperiod
Plant breeding
Pleiotropy
Quantitative Trait Loci - genetics
Quantitative Trait, Heritable
Rice
Seeds
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Summary:Five populations segregated in isogenic backgrounds and three sets of near isogenic lines (NILs) overlapping in a 362.3-kb region covering heading date gene Hd1 were developed from the indica rice cross Zhenshan97 (ZS97)/Milyang 46 (MY46). They were used to analyze the effects of Hd1 on heading date, plant height and yield traits. In a background of the parental mixtures, the photoperiod-sensitive allele derived from ZS97 functioned in promoting and delaying flowering in the natural short-day and long-day conditions, respectively. In the background of ZS97, no response to the photoperiod was observed, whereas the photoperiod-insensitive allele derived from MY46 functioned in delaying flowering, increasing plant height, and enhancing grain productivity. The additive effects estimated in two NIL sets were 6.14 and 6.14 d for heading date, 4.46 and 5.55 cm for plant height, 10.82 and 11.54 for the number of spikelets per panicle, 6.82 and 8.00 for the number of grains per panicle, and 2.16 and 2.23 g for grain yield per plant, which explained 94.1% and 96.3%, 70.5% and 84.8%, 52.4% and 55.2%, 28.9% and 39.2%, and 36.5% and 26.9% of the phenotypic variances, respectively. Since the photoperiod-insensitive allele of Hd1 confers a long vegetative phase, it is a good candidate for breeding rice varieties with high yielding potential for low latitudes.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0052538