|
Screening of rice genotypes for tolerance to low temperature- using chlorophyll fluorescence
|
| |
|
|
|
Abstract: (3329 Views) |
| Rice is a tropical and sub-hopical crop, which is sensitive to low temperature. Chlorophyll fluorescence is a common method for crop screening and monitoring of photosynthesis fluctuations under abiotic stresses. In this experiment, 77 rice genotypes including 49 line of International Rice Cold Tolerance Nursery (IRCTN 2005) and 28 Iranian rice were tested in split plot arrangement using compbility Randomized Design (CRD) in phytotrone for screening and monitoring of their performance. Variences International Rice Research Institute (IRRI) scoring system used for ranking of genotypes at normal and stress conditions. Chlorophyll fluorescence attributes, Chlorophyll content (SPAD values) as well as root and shoot dry weight were measured. Results showed that in low temperature 13/15 oC (night/ day, respectively) qP, ETR, ΦPSII, Fv:Fm, SPAD value and vigor of seedlings as well as root and shoot dry weight significant 7 reduced as compared with normal temperature 22/29 oC (night/day, respectively). Among genetypes of IRCTN No. 33, 34, 36 and 44
(the Philippines) had the highest values and stability of Fv:Fm and ΦPSII parameters in low and normal temperatures while Hoveizeh (from Iran) had the lowest tolerance to low temperature. In addition, there was a highly significant correlation between root dry matter and vigor, showing sensitivity of root to low temperature. Therefore, this parameter could be used as a criterion for selection of tolerant cultivars and genotypes to low temperatuer stress. |
|
| Keywords: Chlorophyll fluorescence, Low temperatuer stress, Rice, Screening, SPAD value |
|
|
Full-Text [PDF 3322 kb]
(1072 Downloads)
|
Type of Study: Scientific & Research |
Subject:
Special
Received: 2015/02/28 | Accepted: 2015/02/28 | Published: 2015/02/28
|
|
|
|
|
|
|
| Add your comments about this article |
|
|
|
