Combining Ability for Quantitative Traits Under Normal And Heat Stress Conditions in Maize (Zea Mays L.)

Investigation was carried out to ascertain the genetic architecture for heat tolerance and yield components from diallel crosses in maize (Zea mays L.). The combining ability in both the normal and heat stress conditions revealed highly significant mean squares due to general combining ability (GCA) and specific combining ability (SCA) in both the direct and reciprocal crosses for all the characters except for anthesis-silking interval in normal condition of the reciprocal crosses. Estimate of components of variance for 13 characters revealed higher SCA variance than that of GCA and reciprocal crosses for all the characters. CML 411 was good general combiner for grain yield in both the conditions, whereas, CML 306 and CML 307 were good general combiners in heat stress condition, and CML 164, CML 304 and CML 305 were average general combiners in normal condition. On the basis of high yield, high SCA and at least high GCA of seed parent, the CML 411*CML 305 and CML 411*CML 307 were identified as promising hybrids for normal and heat stress conditions, respectively. Bangladesh J. Bot. 50(3): 659-669, 2021 (September)

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Combining Ability Estimation and Gene Action in Maize (Zea mays L.), Using Line X Tester Method under Normal Irrigation and Water Stress Conditions

Journal of Plant Production ◽

10.21608/jpp.2016.47014 ◽

2016 ◽

Vol 7 (12) ◽

pp. 1263-1267

Author(s):

M. Sultan ◽

M. Abdel-Moneam ◽

A. EL. Orabi

Keyword(s):

Zea Mays ◽

Water Stress ◽

Combining Ability ◽

Zea Mays L ◽

Gene Action ◽

Stress Conditions ◽

Ability Estimation

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Comparison of teosinte (Zea mexicana L.) and inter-subspecific hybrids (Zea mays L.×Zea mexicana) for high forage yield under two sowing regimes

Crop and Pasture Science ◽

10.1071/cp14155 ◽

2015 ◽

Vol 66 (1) ◽

pp. 49 ◽

Cited By ~ 5

Author(s):

Imtiaz Akram Khan Niazi ◽

Saeed Rauf ◽

Jaime A. Teixeira da Silva ◽

Hassan Munir

Keyword(s):

Zea Mays ◽

Heat Stress ◽

Zea Mays L ◽

Agronomic Traits ◽

Plant Biomass ◽

Stress Conditions ◽

Forage Yield ◽

Total Biomass ◽

Percentage Survival ◽

Biomass Plant

This study was undertaken to evaluate the response of teosinte (Zea mexicana L.) and intersubspecific hybrids to heat stress, in particular productivity. Unlike maize (Zea mays L.), teosinte demonstrated thermophilic properties, namely lower heat injury, sustained chlorophyll content under heat stress (36−45°C) and high percentage survival of seedlings (at 55°C). Teosinte also had the ability to produce large plant biomass (27% and 55% higher yield than maize under non-stressed and stress conditions, respectively) and therefore could be exploited as a forage crop. However, teosinte forage had low animal intake (1.48 kg day–1) because of high pubescence density (10.38 view–1) and low sweetness (9.90°Brix). There was a high percentage of heterosis in variable intersubspecific crosses and traits, and a high magnitude of over-dominance for many traits, for example 5.93–7.06 for total biomass plant–1. Hybrids showed additional advantages, including high oil (20% and 4%) and protein (14% and 25%) contents compared with teosinte under non-stressed and stress conditions, respectively. Moreover, inter-subspecific hybrids were also resistant to heat stress, with the capacity for sustaining growth for a longer period (20% and 33% higher than maize under non-stressed and stress conditions, respectively). Genetic distance between parents—calculated from stable agronomic traits—could be used to select parents for high heterosis under both heat stress and non-stressed conditions.

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