Phule Amol S, Barbadikar Kalyani M, Madhav M S, Subrahmanyam D, Senguttuvel P, Babu M B B Prasad, Kumar P Ananda
1Biotechnology Division, ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana 500030 India.
2Institute of Biotechnology, Professor Jayashankar Telangana State Agricultural University, Hyderabad, 500030 India.
Physiol Mol Biol Plants. 2019 Jan;25(1):197-205. doi: 10.1007/s12298-018-0599-z. Epub 2018 Sep 18.
With the changing climate and rainfall abrasions, there is a gradual shift in the system of rice cultivation from traditional transplanted anaerobic to aerobic system. Studies on the root anatomical and morpho-physiological traits provide insights about the adaptation under aerobic conditions. We investigated the root anatomical and morpho-physiological traits in anaerobic (BPT 5204) and aerobic (CR Dhan 202) adapted rice genotypes grown under anaerobic and aerobic conditions. It was observed that the formation of fewer aerenchyma, thickened root and larger xylem area were critical anatomical traits associated with aerobic adaptation as compared to anaerobic conditions. The root length of CR Dhan 202 significantly increased under aerobic condition which may be attributed to its aerobic adaptation in terms of water acquisition. The photosynthetic rate was significantly higher in CR Dhan 202 as compared to that of BPT 5204 under the aerobic condition. The morpho-physiological results showed that the root length, total dry weight and photosynthetic rate are the key parameters for imparting aerobic adaptation. These root anatomical and morpho-physiological traits associated with the adaptation can be used as screening criteria for phenotyping and selection of genotypes suitable for aerobic system of cultivation. Such study is expected to expedite the development of rice aerobic varieties in aerobic breeding programmes.
随着气候和降雨侵蚀的变化，水稻种植系统正从传统的移栽厌氧系统逐渐向有氧系统转变。对根系解剖结构和形态生理特征的研究为有氧条件下的适应性提供了见解。我们研究了在厌氧和有氧条件下生长的厌氧适应型（BPT 5204）和有氧适应型（CR Dhan 202）水稻基因型的根系解剖结构和形态生理特征。结果发现，与厌氧条件相比，形成较少的通气组织、加厚的根系和较大的木质部面积是与有氧适应相关的关键解剖特征。CR Dhan 202的根长在有氧条件下显著增加，这可能归因于其在水分获取方面的有氧适应性。在有氧条件下，CR Dhan 202的光合速率显著高于BPT 5204。形态生理结果表明，根长、总干重和光合速率是赋予有氧适应性的关键参数。这些与适应性相关的根系解剖结构和形态生理特征可作为表型分析和筛选适合有氧种植系统基因型的标准。此类研究有望加快有氧育种计划中水稻有氧品种的开发。
