Tolerance of 254 Maize Doubled Haploid Lines × Tester Crosses to Drought at Flowering and Grain Filling

Al-Naggar, A; Abdalla, A; Gohar, Ali; Hafez, Emad M.

doi:10.9734/jalsi/2016/29524

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“…These traits could be considered as selection criteria for drought or/and low N tolerance in maize if they proved high heritability and high predicted genetic advance from selection. This conclusion is in accordance with other investigators [2, 22,43,60,61]. It is well known that one of the best indicators of plant tolerance to water stress during flowering and tolerance to low N is the anthesis-silk interval (ASI), as ASI shows a strong negative correlation with grain yield under these stressed conditions [2,62].…”

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confidence: 91%

Secondary Traits for Maize (Zea mays L.) Tolerance to Drought Combined with Reduced N Fertilization Rate

Naggar

Shafik

Musa

2020

AJAHR

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The secondary trait for a given abiotic stress tolerance, should be of strong correlation (r) with grain yield, high heritability (h2b) and high genetic advance (GA) under stressed conditions. The main objective of the present investigation was to identify secondary trait(s) for drought and/or low-N tolerance in maize genotypes. A two-year experiment was conducted, using a split-split-plot design. Main plots were allotted to two irrigation regimes, i.e. well watering (WW) and water stress at flowering (WS), sub-plots to three N fertilizer rates, i.e. low (LN), medium (MN) and high (HN) and sub-sub-plots to nineteen maize genotypes. Analysis of variance of randomized complete blocks design (RCBD) was also performed under each of the six environments (WW-HM, WW-MN, WW-LN, WS-HN, WS-MN and WS-LN). Tolerance to drought and/or low-N was strongly correlated with grain yield/plant (GYPP) under stressed environments. GYPP had high (h2b) and (GA); thus it is considered the best indicator of drought, low N or both stresses tolerance. The best secondary traits are high 100-kernel weight (100-KW), ears/plant (EPP), kernels/row (KPR), and short anthesis-silking interval (ASI) for low-N tolerance, high EPP, 100-KW, plant height (PH) and short ASI for drought tolerance, high 100-KW, EPP, KPR, PH and short ASI, for tolerance to drought combined with low N, and high 100-KW, rows/ear (RPE) and KPR under optimum conditions (WW-HN), since they show high (r), high (h2b) and high (GA) estimates under the respective environments. Under low-N and/or drought, future research should focus on the incorporation of secondary traits such as EPP, KPR, 100-KW, PH, ASI in the selection programs along with the grain yield trait.

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