The development of potential drought- and salinity- tolerant rice (Oryza sativa L.) through heterosis breeding
2020
Rohayu Ma’arup | Muhammad Nurshafiq Azlan | Noor Rashidah Md Rashid | Nurul Athirah Karim
Climate change and extreme conditions significantly reduce rice production. In order to improve food security in Malaysia, the development of high-yielding rice varieties with drought and salinity tolerance are of utmost importance. In this study, F₁ hybrids were developed using MR263 and MR219 (high-yielding rice) and IURON 6, IURON 14, IURON 18 and IURON 21 (upland rice) as female parents, with drought-tolerant variety Dular and salinity-tolerant variety Pokkali as male parents to generate different F₁ hybrid combinations in the field. The F₁ phenotyping screening was done based on the diameter of the stomata opening, chlorophyll content, plant height, length of flag leaf, diameter of flag leaf, length of seeds and width of seeds. Significant differences (p < 0.05) were observed for most traits when F₁ hybrids were compared with parental cultivars, indicating the deployment of drought- and salinity-tolerant genes from the male parents. A significantly (p < 0.05) smaller stomata opening at midday with a high grain width compared with the female plant (MR263) and high grain length compared with the male plant (Pokkali) were observed in F₁ hybrids M(i-iii) and M(iv). The development of doubled haploid plants is currently ongoing, thus would reduce cultivar development time.
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Este registro bibliográfico ha sido proporcionado por Universiti Putra Malaysia