Genetic divergence and path analysis in wheat cultivars under heat stress

Abstract

One of the biggest limitations for the wheat crop expansion to Brazilian tropical regions is the high temperature in the rainy season. This study aimed to select, based on genetic divergence and path analysis, cultivars that tolerate cultivation in the summer (heat stress). Nine wheat cultivars were sown, using a randomized block design with three replications, with plots consisting of 10 rows of 6 m and row spacing of 0.15 m. The highest grain yield and number of ears m-2 were observed for the CD 150 cultivar and the largest 1,000-grain weight for CD 116. BRS 220, IPR 136, IPR 144 and BRS Pardela had the highest number of sterile spikelets. The highest number of grains per ear was observed for CD 150, CD 116, BRS Pardela, IPR 130 and IPR 85, showing direct effects on grain yield, evidenced by the path analysis. CD 116 and CD 150 were the most productive cultivars and can be considered as possible parents in wheat breeding programs. IPR 85, CD 116, CD 108 and CD 150 showed a greater tolerance to high temperatures.

Can saline irrigation improve the quality of tomato fruits?

“…2014). Also, the UPGMA clustering method demonstrated great precision under abiotic stress conditions in the wheat ( Triticum aestivum L.) crop to select possible parents in plant‐breeding programs (Oliveira et al., 2020).…”

“…The UPGMA clustering method, based on the generalized Gower distance, is the most consistent and indicated to characterize the genetic divergence among genotypes and provides greater precision when selecting cultivars for future crosses (Araújo et al 2014). Also, the UPGMA clustering method demonstrated great precision under abiotic stress conditions in the wheat (Triticum aestivum L.) crop to select possible parents in plant-breeding programs (Oliveira et al, 2020).…”

“…It is possible to estimate the variables with the most significant positive and negative effects on crop yield through statistical analysis. Based on this, it is possible to select genotypes with greater tolerance to the abiotic stresses effects through indirectly assessed traits (Oliveira et al., 2020). In this sense, the study aimed to investigate the effect of irrigation with saline water on fruit quality, yield, and plant nutrition of tomato cultivars.…”

Effect of water deficit on morphoagronomic traits of black common bean genotypes (Phaseolus vulgaris L.) with contrasting drought tolerance

“…IPR Uirapuru and LP 08‐90 are moderately tolerant with good levels of adaptability and stability under water deficit (Figure 4). Thus, these genotypes may have their genetic diversity assessed to constitute cross‐breeding blocks involving stable, adapted, and divergent genotypes (Araújo et al, 2014; Oliveira et al, 2020).…”

“…One of the difficulties encountered by breeding programmes is to select parents based on the different evaluated traits to increase crop yield under stressful conditions (Oliveira et al, 2020). It is important to identify traits with high correlation with grain yield, based on the greatest direct effects to perform selection indirectly (Cruz et al, 2012).…”