Breeding of heat-tolerant cultivars requires knowledge of the genetic behavior of morpho-physiological traits. Gene action was investigated using wide phenotypic segregation ranging across six generations (P₁, P₂, F1, BC₁, BC₂ and F₂) of four different tolerant × sensitive crosses for grain filling duration, GFD (40.14–46.20); canopy temperature depression, CTD (2.42–5.97); normalized difference vegetation index, NDVI (0.35–0.61); membrane thermostability index, MSI (31.40–40.93); no. of grains/spike, GN/SP (26.29–54.80); thousand-grain weight, TGW (31.70–44.45); and grain yield/plant, GY (15.37–24.89) under terminal heat stress. Scaling results indicated an absence of epistasis for MSI and TGW in cross PBN51 × HUW510. The prominence of Dominance × dominance interaction over additive × additive and additive × dominance interactions along with significant dominant gene effect [h] for all traits except MSI was observed. For MSI, similar signs of [d] and [i] along with significant [j] showed the possibility of exploitation of additive gene effect. CTD, NDVI and GN/SP were controlled by duplicated epistasis, whereas both complementary and duplicate epistasis was found for GFD. Digenic interactions with prominent duplicate epistasis indicate that biparental mating or diallel selective mating might be efficiently utilized for their improvement. The present investigation indicated a preponderance of non-additive gene action for studied traits, thus, implying toward delaying of selection to the later generations to exploit transgressive segregants. Any conventional breeding strategy would be followed for generating the cultivars with low CTD, reduced cell membrane injury, with higher NDVI, TGW, GFD, no. of grains/spike and grain yield/plant.

耐热品种的育种需要了解形态生理性状的遗传行为。使用跨越六代（P ₁，P ₂，F1，BC ₁，BC ₂和F _2）的广泛表型分离研究了基因作用）四个不同的耐性×敏感杂交，用于籽粒灌浆持续时间，GFD（40.14–46.20）；冠层温度下降，CTD（2.42-5.97）；归一化植被指数NDVI（0.35-0.61）；膜热稳定性指数，MSI（31.40–40.93）；不。谷粒/穗状花序，GN / SP（26.29–54.80）；千粒重，TGW（31.70–44.45）；和终末热胁迫下的籽粒产量/植物，GY（15.37–24.89）。缩放结果表明，在交叉PBN51×HUW510中，没有MSI和TGW的上位性。观察到除MSI之外的所有性状的显性×显性交互作用超过加性×加性和加性×显性交互作用以及显着的显性基因效应[h]。对于MSI，[d]和[i]的相似符号以及显着的[j]表明可能利用加性基因效应。CTD，NDVI和GN / SP受重复上位性控制，而GFD发现互补和重复上位性。具有明显的重复上位性的双基因相互作用表明，双亲交配或二烯选择性交配可以有效地用于它们的改良。目前的研究表明，对于所研究的性状，非加性基因作用占优势，因此，这意味着向后代的选择延迟了对侵袭性隔离子的利用。将遵循任何常规育种策略来产生具有较低CTD，减少细胞膜损伤，具有较高NDVI，TGW，GFD的栽培品种。谷物/穗和谷物产量/植物。具有明显的重复上位性的双基因相互作用表明，双亲交配或二烯选择性交配可以有效地用于它们的改良。目前的研究表明，对于所研究的性状，非加性基因作用占优势，因此，这意味着向后代的选择延迟了对侵袭性隔离子的利用。将遵循任何常规育种策略来产生具有较低CTD，减少细胞膜损伤，具有较高NDVI，TGW，GFD的栽培品种。谷物/穗和谷物产量/植物。具有明显的重复上位性的双基因相互作用表明，双亲交配或二烯选择性交配可以有效地用于它们的改良。目前的研究表明，对于所研究的性状，非加性基因作用占优势，因此，这意味着向后代的选择延迟了对侵袭性隔离子的利用。将遵循任何常规育种策略来产生具有较低CTD，减少细胞膜损伤，具有较高NDVI，TGW，GFD的栽培品种。谷物/穗和谷物产量/植物。暗示着将选择推迟到后代来利用侵略性隔离子。将遵循任何常规育种策略来产生具有较低CTD，减少细胞膜损伤，具有较高NDVI，TGW，GFD的栽培品种。谷物/穗和谷物产量/植物。暗示着将选择推迟到后代来利用侵略性隔离子。将遵循任何常规育种策略来产生具有较低CTD，减少细胞膜损伤，具有较高NDVI，TGW，GFD的栽培品种。谷物/穗和谷物产量/植物。