QTL mapping for heat tolerance related traits using backcross inbred lines in wheat (Triticum aestivum L.)

IF 1 4区生物学 Q3 PLANT SCIENCES Indian Journal of Genetics and Plant Breeding Pub Date : 2020-09-22 DOI:10.31742/IJGPB.80.3.2

Harikrishna, Sunil, D. Upadhyay, Rahul Gajghate, P. Shashikumara, D. Chouhan, Swetha Singh, V. Sunilkumar, B. Manu, Nivedita Sinha, Sanjay Singh

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引用次数: 9

Abstract

Heat stress is one of the most limiting factors for the production of wheat. Global warming and consequent changes in climate adversely affect wheat plant growth and yield. To elucidate genetic basis and map heat tolerance traits, a set of 134 backcross inbred lines (BILs) derived from the cross between WH730/*2 HD2733 was used. The population was evaluated under late sown (LS) and very late sown (VLS) conditions, by exposing to heat stress during rabi season. Positive association of normalized difference vegetation index (NDVI), thousand grain weight (TGW), grain weight per spike (GWS), biomass and grain yield (GY) under both production conditions was observed. However, canopy temperature (CT) and days to heading (DH) showed negative correlation with GY under heat stress. A total of 9 Quantitative trait loci (QTL) were discovered on 7 chromosomes, which includes 4 QTLs in LS and 5 QTLs under VLS condition. Combining the results of these QTLs revealed a major stable QTL for DH (qDH_iari_5A) on chromosome 5A with 23% and 26% explaining phenotypic variance under both sowing conditions. QTL for NDVI was detected on chromosome 1B while QTL for SL and GY on chromosome 2A. The identified QTLs in the genomic regions could be targeted for genetic improvement and marker assisted selection for heat tolerance in wheat.

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小麦回交自交系耐热性相关性状的QTL定位

热胁迫是影响小麦产量的主要因素之一。全球变暖和随之而来的气候变化对小麦的生长和产量产生不利影响。利用WH730/*2 HD2733杂交的134个回交自交系(BILs)，阐明遗传基础，绘制耐热性状图谱。通过在兔季暴露于热胁迫下，对晚播(LS)和晚播(VLS)条件下的种群进行评价。两种生产条件下，归一化植被指数(NDVI)、千粒重(TGW)、穗粒重(GWS)、生物量和籽粒产量(GY)呈显著正相关。热胁迫下，冠层温度(CT)和抽穗期(DH)与GY呈负相关。在7条染色体上共发现9个QTL，其中LS条件下4个，VLS条件下5个。综合这些QTL的结果，在5A染色体上发现了一个主要稳定的DH QTL (qDH_iari_5A)，在两种播种条件下解释表型变异的比例分别为23%和26%。NDVI QTL位于1B染色体上，SL和GY QTL位于2A染色体上。这些基因组区域的qtl可作为小麦耐热性遗传改良和标记辅助选择的靶点。

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来源期刊

Indian Journal of Genetics and Plant Breeding PLANT SCIENCES-

CiteScore

1.80

自引率

10.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Advance the cause of genetics and plant breeding and to encourage and promote study and research in these disciplines in the service of agriculture; to disseminate the knowledge of genetics and plant breeding; provide facilities for association and conference among students of genetics and plant breeding and for encouragement of close relationship between them and those in the related sciences; advocate policies in the interest of the nation in the field of genetics and plant breeding, and facilitate international cooperation in the field of genetics and plant breeding.