Combining ability analysis for evaluation of maize hybrids under drought stress

Malook, Saif ul; Ali, Qurban; Ahsan, Muhammad; Shabaz, Muhammad Khalid; Waseem, Muhammad; Mumtaz, Aamir

doi:10.4038/jnsfsr.v44i2.8003

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…The variety Buhooth 106 did not differ with the variety 5012 as well as the Zm7 inbred significantly. When comparing the selected genotypes, the RSCA-S1-2 genotype, which had 17.80 rows, did not differ significantly with 4 genotypes, where the effectiveness of recurrent selection was in increasing the number of ear rows compared to the varieties, and when comparing the selected genotypes, we note the superiority of the RSCA genotypes over RGCA, as well as the superiority of the genotypes selected from the S2 recombination, most of them did not differ significantly, and this agrees with what was found by (25). The results showed that the values of and C.V were moderate, and they were 0.42 and 11.88 respectively, which indicates the average homogeneity of the data taken.…”

Section: Number Of Rows Per Earsupporting

confidence: 89%

Recurrent Selection for General and Specific Combining Ability in Maize

Zeyad A. Abdulhamed,

Nihad.M. Abood,

Abdulsamad. H. Noaman

2024

Iraqi J. Agric. Sci.

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This study was aimed to identify efficiency of recurrent selection program to improve maize population. This program was applied to var. Buhooth 106 with var. 5012 Using RGCA with the inbred Zm7 for the production of RSCA. The recurrent selection program was implemented for four consecutive seasons (2020 - 2021) at the Fields Station of the College of Agriculture - University of Anbar. In the spring season 2020, 100 top crosses were obtained from both varieties and progeny. During the fall season 2020, an experiment was carried out to compare the top crosses of each variety RGCA and RSCA using a 10 × 10 partially balanced lattice design.. Six genotypes from each genetic population as well as Buhooth 106 and 5012 and Zm7 inbreds). The genotype-S1-2 RSCA achieved the lowest female flowering period for females 61.50 days, the highest number of rows per ear 17.80 rows, and the highest grain yield 177.82 g. The genotype-S1-3 RSCA achieved the highest leaf area 0.593 m2 and the highest number of kernels per row 43.11 kernel. The broad sense heritability of the traits of the number of rows and the number of kernels in the row and the yield of the plant reached 53.23%, 73.85% and 41.94%, respectively, and high genetic advance for kernels per row and grain yield of 4.79 and 15.52 respectively.

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Section: Number Of Rows Per Earsupporting

confidence: 89%

Recurrent Selection for General and Specific Combining Ability in Maize

Zeyad A. Abdulhamed,

Nihad.M. Abood,

Abdulsamad. H. Noaman

2024

Iraqi J. Agric. Sci.

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“…High significant GCA effects for grain yield and short days to 50% tasseling and days to 50% silking are important for enhancing yielding potential and early maturity [ 42 ]. Malook et al and Issa et al [ 44 , 45 ] identified inbred lines which had highest and positively significant GCA effects for grain yield and other agronomic traits under drought stress. GCA-female and male effects favorably influenced grain yield under FIRR, revealing the ability of lines eight inbred lines (Entry 4, 5, 6, 9, 10, 15, 19 and 22) to develop high yielding hybrids and good parental source of genes for the trait, in contrast to inbred lines 11 and 12, which showed unfavorable GCA-female effects for the same trait.…”

Section: Discussionmentioning

confidence: 99%

Genetic analysis of tolerance to combined drought and heat stress in tropical maize

Elmyhun,

Abate,

Abate

et al. 2024

PLoS ONE

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Simultaneous occurrences of heat and drought stresses have a detrimental effect on growth, development and yield of maize. Heat and drought is expected to worsen maize yield losses under climate change. Selecting CDHS tolerant maize hybrids creates great opportunity for sustainable maize improvement in the tropics. The objective of current investigation was to dissect the genetic basis of CDHS tolerance in tropical maize and to determine performance of single cross hybrids under CDHS. Ninety six single-cross hybrids resulted from crossing 12 tassel blast tolerant and 12 tassel blast susceptible lines along with two Striga resistant commercial hybrids, a heat tolerant and a heat susceptible check hybrids were evaluated under FIRR, MDRTS and CDHS using 25x4 alpha lattice design with two replications. The results showed significant genetic variation for FIRR, MDRTS and CDHS tolerance among maize hybrids. The majority of single crosses that showed improved grain yield over their respective standard checks under MDRTS also exhibited improved grain yield over the same checks under CHDS, indicating development of CHDS tolerance hybrids. Significant and positive genotypic and phenotypic correlation of grain yield under MDRTS and CDHS implicated common genetic mechanisms controlling yield under MDRTS and CDHS. Stress tolerance indices YI, GMP, MP, HM and STI were identified as best selecting indices under both stresses. GCA variances were larger than SCA variances in each testing environment for most studied traits indicating the impotence of additive gene action than non-additive gene action to control these traits. Majority of stress indices and SCA effects demonstrated that hybrids HB18, HB41, HB91 and HB95 were high yielder under MDRTS and CDHS. Hybrids HB41, HB91 and HB95 and their parents’ scored minimum tassel blast. Parents 19 and 7 were well general combiner for grain yield and early maturity under MDRTS and CDHS indicting their valuable source of genes for hybridization. The current findings revealed that CDHS tolerance hybrids can reduce expected yield losses and maintain maize productivity in CDHS prone areas. Promising hybrids should be tested further under various drought and CHDS for commercialization.

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“…This also provides a guideline for selection of elite parents and desirable cross combinations to be used in formulation of a systematic breeding project for rapid improvement. In this respect, general and specific combining abilities had been estimated under drought stress conditions in maize by several in vestigators ( Aminu et al, 2014;Al-Naggar et al, 2016b;Saif-ul-Malook et al, 2016;Ertiro et al, 2017 andMurtadha et al, 2018 ). Therefore, the present investigation was conducted to identify desirable parents and cross combinations as well as to gather information on the genetic behavior of grain yield and its contributing characters under water stress conditions.…”

Section: Reduction Of Current Water Resources In Egypt Will Adversely...mentioning

confidence: 99%

Response Selection for Drought Toleranc in Maize

Dakrory,

Okaze,

Hagar

et al. 2023

Zagazig Journal of Agricultural Research

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The present study was carried out in 4 seasons during 4 years from 2017 to 2020 at the field of BeniSuef in. Res. Sta., Middle Egypt com. The main objectives were to develop new maize populations of increased tolerance to drought and evaluate predicted and actual gains from one cycle of S 1 recurrent selection. Two sets of 121 S 2 's were developed from the local population Pop 277, the 1 st set was evaluated under well water (WW) and intermediate water-stress (IWS) conditions. The highest yielding 18 lines (15%) were selected under each environment. Intercrossing of the two groups of 18 S 1 's was done in separate blocks. The resulted of new 2 populations, Pop277-IWS and Pop277-WW) indicated wide genetic variation among S 1 progenies for most studied traits under all selection environments. Broad sense heritability estimates were generally higher under water-stress than under non-stress conditions. Results indicated that anthesis -silking interval, ears plant -1 and stay green traits could be valuable criteria in increasing the selection efficiency for drought tolerance. Actual superiority in grain yield over Pop277 due to one cycle of S 1 recurrent selection was (26.77%) by the improved populations (Pop277-IWS),

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Combining ability analysis for evaluation of maize hybrids under drought stress

Cited by 6 publications

References 18 publications

Recurrent Selection for General and Specific Combining Ability in Maize

Recurrent Selection for General and Specific Combining Ability in Maize

Genetic analysis of tolerance to combined drought and heat stress in tropical maize

Response Selection for Drought Toleranc in Maize

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