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- 저자 : Khan Sultan Habibullah (검색결과 3 건)
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Khan Sultan Habibullah,Sajjad Muhammad,Gulnaz Saima,Waqar Sundas,Shahzad Munawar,Arain Saima Mir 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.2
Understanding genetic architecture of a crop germplasm is necessary for designing a successful breeding program. Herein, we evaluated a large collection of 500 spring wheat accessions for 2 crop seasons to dissect the genetics of 11 yield components and their direct and indirect contributions to grain yield (GY). The genetic estimates of broad sense heritability (h2 ), genetic advance (GA), phenotypic correlation (rp), genotypic correlation (rg), and path coefcient analysis were performed. Signifcant genetic variation was observed for all yield traits suggesting that GY can be improved by exploiting the studied yield traits. Phenotypic coefcient of variation (Vp) was greater than genotypic coefcient of variation (Vg) for all studied traits. Higher broad sense h2 and GA were observed for grains per plant (GpP), spikes per plant (SpP), spikelets per spike (Spt/S) and grain yield (GY). The GY exhibited signifcant and positive correlation with all studied traits except with spikelet density (SptD). The GpP and TGW exhibited positive direct efect on increasing grain yield. Taking together, SpP, GpS, TGW and SDW are the major contributors to improving genetic yield potential of bread wheat with spring growth habit. The negative correlation between GY and SptD was dissected in path coefcient analysis as negative indirect efect of SptD on GY through reduced GpS and TGW. Our study provides new insights on the association of GpP, TGW and SDW in bread wheat. The GpP, TGW and SDW are infuenced by SpP, Gpt/S, G/Spt, SptD, AL and PH with indirect efects on GY. To improve yield potential in wheat, the traits with direct efects (GpP, TGW and SDW) and indirect efects (e.g., SptD) can be used as selection criteria.
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The Low Down on Association Mapping in Hexaploid Wheat (Triticum aestivum L.)
Muhammad Sajjad,Sultan Habibullah Khan,Abdul Mujeeb Kazi 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.3
The past few decades have witnessed hundreds of family-based linkage studies mapping for numerous traits but only a limited number of QTLs were actually cloned, tagged, or used for marker-assisted selection. Although providing valuable information, this conventional approach cannot be scaled up to underpin the incredible amount of phenotypic variation in the form of 266, 589 hexaploid wheat accessions maintained in public germplasm collections. Association mapping has recently emerged as an alternative and more powerful mapping approach where a natural population is surveyed to determine marker-trait associations using linkage disequilibrium (LD). After its first application for milling quality in 2006, association mapping studies in hexaploid wheat are being extended to tag yield traits, protein quality, and tolerance to biotic and abiotic stresses. Advances in genotyping technology and statistical approaches greatly accelerated the shift from conventional linkage-based mapping to LD-based association mapping. Association mapping stands out because of simultaneous utilization of a large number of ex situ-conserved natural variation due to historical recombination events accumulated over centuries.
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The Low Down on Association Mapping in Hexaploid Wheat (Triticum aestivum L.)
Sajjad, Muhammad,Khan, Sultan Habibullah,Kazi, Abdul Mujeeb 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.3
The past few decades have witnessed hundreds of family-based linkage studies mapping for numerous traits but only a limited number of QTLs were actually cloned, tagged, or used for marker-assisted selection. Although providing valuable information, this conventional approach cannot be scaled up to underpin the incredible amount of phenotypic variation in the form of 266, 589 hexaploid wheat accessions maintained in public germplasm collections. Association mapping has recently emerged as an alternative and more powerful mapping approach where a natural population is surveyed to determine marker-trait associations using linkage disequilibrium (LD). After its first application for milling quality in 2006, association mapping studies in hexaploid wheat are being extended to tag yield traits, protein quality, and tolerance to biotic and abiotic stresses. Advances in genotyping technology and statistical approaches greatly accelerated the shift from conventional linkage-based mapping to LD-based association mapping. Association mapping stands out because of simultaneous utilization of a large number of ex situ-conserved natural variation due to historical recombination events accumulated over centuries.
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