The effects of drought stress on the yield and some biochemical characteristics of four Maize hybrids in the gorgan climate coditions

Subject Areas : Tension

Mansour Esmaily ¹ , Mohamad Reza Dadashi ² , Mohamad Taghi Feyzbakhsh ³ , Kami Kaboosi ⁴ , Fatemeh Shaikh ⁵

1 - Department of Agriculture, Gorgan Branch, Islamic Azad University, Gorgan, Iran.
2 - Department of Agriculture, Gorgan Branch, Islamic Azad University, Gorgan, Iran
3 - Agricultural and Natural Resource Research and Education Center Agricultural Research. Gorgan. Iran.
4 - Department of Agriculture, Gorgan Branch, Islamic Azad University, Gorgan, Iran
5 - Department of Agricultural and Horticultural Research , Golestan Province Agriculture and Natural Resources Research and Education Center, Agricultural Research, Education and Promotion Organization, Gorgan, Iran

Received: 2022-08-01 Accepted : 2022-10-07 Published : 2024-03-20

Keywords: Carotenoid, Chlorophyll, Irrigation regime, Seed yield, Soluble sugar, Proline,

Abstract :

In order to evaluate the effects of drought stress on the yield and some biochemical characteristics of four Maiz hybrids in the Gorgan climate conditions, an experiment was conducted as a split split plot based on a randomized complete block design with three replications during 2022. The main factor was drought stress at four levels (100, 75, 50, and 25% of water use) and the secondary factor was four maize hybrids (SC703, SC704, ZP548, and BK50). The results of analysis of variance showed that the effects of drought stress and hybrid on all traits (chlorophyll a, chlorophyll b, total chlorophyll (a+b), carotenoid, soluble sugar, proline, number of rows, number of seed in rows, thousand seed weight and grain yield) were significant. On the other hand, the interaction effects of drought stress × hybrid were also significant on all traits except proline and the number of rows. The results of mean comparison showed that the highest amount of proline (9.91 mol/g^-1) and soluble sugar (30.2 mg/g^-1) were obtained from the 25% water requirement. With an increase in drought stress, the amounts of chlorophyll a, chlorophyll b, total chlorophyll (a+b), and carotenoids decreased. Also, the highest seed yield (8450 kg/ha^-1) was observed in hybrid Zp548 from 100% water requirement, but it was in the same statistical group as 75% of water use (7934.3 kg/ ha^-1). At other levels of drought treatments, the highest seed yield was obtained from hybrid Zp548. Therefore, treatment of 75% water use and the sowing of ZP548 hybrid in Gorgan region is recommended.

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