Abstract
Abstract Flooded rice paddy fields act as a source of greenhouse gas emissions. So, the efforts to increase the drought tolerance of rice represent a much more environmentally friendly solution, and may bring a significant contribution to prevent global warming. The experiment was laid out in a split-plot design with ten replicates. Rice cultivars treated with different levels of γ irradiation and sodium azide (SA) soaking time were allocated in the main plots, and mutagen groups in sub-plots. We use the generalized linear models, as implemented in the GLIMMIX procedure of SAS University Edition, to analyze agronomic performances. These results showed that the genotypes in M1 generation present diversity under the drought stress level of -0.03 MPa, and the best combination between cultivar and mutagen is Inpago Unsoed 1 that was irradiated with γ 100 Gy and then soaked in SA for 2h. These genotypes can be used as a sources of drought tolerance in future rice breeding programmes.
Highlights
The flooded rice fields have been known as important sources of anthropogenic methane (CH4) emission, greenhouse gas (GHG) (Chun et al 2016)
According to Joshi et al (2011), the aromatic cultivars are more sensitive to the drought stress than the non-aromatic cultivars, as total proline content of aromatic cultivar is always lower on several levels of drought stress
The response of upland cultivar on the early drought stress was known to be more efficient related to the upregulation on more stress-related genes in which water-retention ability was stronger and water potentially was able to be taken more than the lowland cultivar (Ding et al 2013)
Summary
The flooded rice fields have been known as important sources of anthropogenic methane (CH4) emission, greenhouse gas (GHG) (Chun et al 2016). The induction mutation with the treatment of gamma irradiation, sodium azide, and their combination were reported to improve the rice yield by 7-40% (Siddiqui and Singh, 2010; Shehzad et al 2011), and to improve the resistance under drought stress from -0.0021 to -0.0077 MPa (He et al 2009; Aurabi et al 2012). Rice with drought-resistance and high-yielding characters are definitely achieved through the rigorous selection methods (Mohapatra et al 2014). We performed agronomic analysis to find the best combination between cultivar and mutagen in M1 generation under drought stress level of -0.03 MPa. This study is expected to provide useful information in the improvement of drought-resistance characters on rice
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