Cold tolerance at the germination stage of rice : methods of evaluation and characterization of genotypes

By Renata Pereira da Cruz, S. Milach. 2004

106 citations recorded by the source corpus.

Rice cold tolerance at the germination stage is important in Rio Grande do Sul (RS) where temperatures below 15°C prevent or reduce germination and plant establishment in early sowings. The present study aimed at identifying an adequate method for cold tolerance evaluation of the rice germination stage and at verifying the variability among 24 rice genotypes of different origins. Cold tolerance was evaluated in experiment I, germination under two conditions: 13°C for 28 days and 28°C for seven days, and in experiment II, germination under 28°C for 72 hours, 13°C for 96 hours and again 28°C for 72 hours. In experiment I measured characteristics were germination index, percentage of seeds with coleoptile length superior to 5 mm and percentage of reduction in coleoptile length due to cold. In experiment II the measured characteristic was coleoptile regrowth after the cold period. Cold tolerance varied among genotypes studied in both experiments, but only the percentage of reduction in coleoptile length and coleoptile regrowth allowed a better distinction between the tolerant checks and the susceptible one. In general, genotypes belonging to the Japonica subspecies presented higher cold tolerance than Indica, but there was variability within subspecies. The most adequate method of evaluation of cold tolerance is through percentage of reduction in coleoptile length and coleoptile regrowth. Among Japonica genotypes, Quilla 64117 and Diamante presented the highest cold tolerance, and among Indica, cultivars BR-IRGA 410 and IRGA 416 were the most cold tolerant at the

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/5fc63aad1f6bfbd10e8b5a9deee4c0f4baae9cea

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Plant Science

1. H. Hussain
2. S. Hussain
3. S. Anjum
4. Longchang Wang
5. S. Men
6. Abdul Khaliq
7. U. Ashraf

Citations in the corpus

• Chilling and Drought Stresses in Crop Plants: Implications, Cross Talk, and Potential Management Opportunities (2018, background): “Chilling stress severely impairs the germination and often lowers the seedling vigor (Kang and Saltveit, 2002; Wang et al., 2016), delays plant development and ultimately causes severe yield losses (Cruz and Milach, 2004; Oliver et al., 2007; Ruelland et al., 2009).”