Early Sowing Date as A Cultivation Strategy to Alleviate Drought Effects ‎On Yield Components of Different Canola Genotypes

Iranian Journal of Plant Physiology

مقاله 1، دوره 12، شماره 2، شهریور 2022، صفحه 4065-4073   

نوع مقاله: Original Article

شناسه دیجیتال (DOI): 10.30495/ijpp.2021.1907285.1251

نویسندگان

Nadia Gharechaei^{* 1}؛ Amir Hossein Shirani Rad²؛ Nasser Shahsavari³

¹Department of Agronomy, Faculty of Agriculture, Karaj Branch, Islamic Azad University‎, Karaj, Iran

²Seed and Plant Improvement Institute (SPII), Agricultural Research, Education and ‎Extension Organization (AREEO), Karaj, Iran.‎

³Department of Crop production, Hajiabad Branch, Islamic Azad university, Hajiabad, Iran.

چکیده

Water shortage or drought stress is an environmental factor that strongly affects crops ‎productivity in various regions of the world. Sowing date as a factor affecting the growth ‎and yield of oilseed crops can alleviate drought stress occurring in reproductive stage. To ‎assess this, agronomic and physiological response of five canola genotypes (L1030, L1204, ‎L1110, L1114 and Okapi) to drought stress were evaluated at two early and late sowing ‎dates (7th and 27th October, respectively) as a two-year field experiment. Results showed ‎that drought stress significantly reduced the seed yield and yield components of all ‎genotypes at both sowing dates, which was a consequence of damage to photosynthetic ‎pigments, reduction of relative water content. However, early sowing was able to alleviate ‎drought stress effect; as seed yield of different genotypes at early sowing were 38-47% ‎higher than late sowing. Moreover, the measured oil content was not influenced by drought ‎stress and sowing date, so the highest oil content at both sowing dates were recorded in ‎L1204 genotypes. Finally, the results showed that sowing of suitable genotype in the proper ‎date could be an appropriate approach to canola sowing in semi-arid areas.‎

کلیدواژه‌ها

drought stress؛ oil content؛ rapeseed؛ seed yield؛ podding stage

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