Sohrabi M, Rafii M Y, Hanafi M M, Siti Nor Akmar A, Latif M A
Institute of Tropical Agriculture, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia.
ScientificWorldJournal. 2012;2012:416291. doi: 10.1100/2012/416291. Epub 2012 Apr 30.
Genetic diversity is prerequisite for any crop improvement program as it helps in the development of superior recombinants. Fifty Malaysian upland rice accessions were evaluated for 12 growth traits, yield and yield components. All of the traits were significant and highly significant among the accessions. The higher magnitudes of genotypic and phenotypic coefficients of variation were recorded for flag leaf length-to-width ratio, spikelet fertility, and days to flowering. High heritability along with high genetic advance was registered for yield of plant, days to flowering, and flag leaf length-to-width ratio suggesting preponderance of additive gene action in the gene expression of these characters. Plant height showed highly significant positive correlation with most of the traits. According to UPGMA cluster analysis all accessions were clustered into six groups. Twelve morphological traits provided around 77% of total variation among the accessions.
遗传多样性是任何作物改良计划的先决条件，因为它有助于培育出优良的重组体。对50份马来西亚旱稻种质进行了12个生长性状、产量及产量构成因素的评估。所有性状在种质间均表现出显著和极显著差异。剑叶长宽比、小穗育性和开花天数的基因型和表型变异系数幅度较高。单株产量、开花天数和剑叶长宽比的遗传力高且遗传进展大，表明这些性状的基因表达中加性基因作用占主导。株高与大多数性状呈极显著正相关。根据UPGMA聚类分析，所有种质被分为六组。12个形态性状提供了种质间约77%的总变异。
