Identification and Analysis of Panicle Differentiation Characteristics and Cold Tolerance Ability of Two Wheat Varieties in Southern Huang-Huai Wheat Region
To assess the cold tolerance ability of the state-approved wheat variety'Xinong 100'and the wheat regional experimental control variety'Zhoumai 18'in the southern Huang-Huai wheat region,a field ex-periment was conducted to investigate the panicle differentiation characteristics and low-temperature stress re-sponses in an artificial climate chamber using'Zhoumai 18'as the regional control.The seed-setting rate,leaf stress physiological indexes,and microstructure were measured,and differences between the two varieties were analyzed after 6,12,and 24 hours of low-temperature treatment.The results showed that'Xinong 100'exhibited earlier ear differentiation compared to'Zhoumai 18'under field conditions in the Guanzhong region of Shaanxi.Under low-temperature stress during the flag leaf stage,the activities of SOD and CAT increased in'Xinong 100',while the soluble sugar content was significantly lower compared to'Zhoumai 18'.Microstructural analy-sis showed significant breakdown and atrophy of sclerenchyma cells in wheat leaves due to low-temperature stress.Leaf thickness in'Xinong 100'remained unchanged after 6 hours of low-temperature treatment,while'Zhoumai 18'significantly reduced,although no significant difference was observed between the two varieties after 12 hours of treatment.Overall,both'Xinong 100'and'Zhoumai 18'exhibit resistance characteristics to late spring cold spells.
Wheat(Triticum aestivum L.)Biological characteristicsSpike differentiationCold spell in later spring
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