Effects of acclimation on chilling tolerance in Asian cultivated and wild rice |
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Authors: | Akhil Ranjan Baruah Kazumitsu Onishi Yasuyo Oguma Noriko Ishigo-Oka Naohiro Uwatoko Yoshio Sano |
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Institution: | (1) Plant Breeding Laboratory, Department of Applied Science, Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan;(2) Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat, Assam, 785013, India;(3) Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Nishi 2-11, Obihiro Hokkaido, 080-8555, Japan |
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Abstract: | Tolerance to low temperature can be enhanced by pre-exposure to low, non-harmful temperatures, a process known as acclimation.
The effects of acclimation on chilling tolerance in species from tropical and subtropical regions are not well understood.
Therefore, we investigated whether acclimation improved chilling tolerance at the plumule and seedling stages in Asian rice.
A comparison of the effect of acclimation between chilling tolerance scores from a tolerant (A58) and a susceptible (W107)
strain demonstrated that acclimation enhances chilling tolerance especially in the tolerant strain, indicating that considerable
genetic variation in acclimation capacity exists. The genetic variation in chilling tolerance in acclimated plants was investigated
using 57 strains derived from cultivated (Oryza sativa L. ssp. japonica and ssp. indica) and wild (O. rufipogon Griff.) rice. The genetic differentiation of the japonica and indica subspecies of cultivated rice with regard to chilling tolerance was more prominent in the presence than in the absence of
acclimation. Furthermore, latitudinal clines for chilling tolerance were observed in both acclimated plumules and seedlings
of wild rice, whereas without acclimation, a latitudinal cline was observed only at the plumule stage. This suggests that
acclimation capacity, as well as intrinsic chilling tolerance, might contribute to local adaptation. QTLs involved in acclimated
chilling tolerance at the plumule stage are different from those involved in intrinsic chilling tolerance. The present results
indicate that the maximum genetic potential for chilling tolerance is achieved by acclimation, giving cautions for evaluation
of genetic resources in rice. |
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