Identication Of New Sources Of Rice Genotypes (Oryza Sativa L.) Tolerant To Cold Stress
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
Research Square
Abstract
Rice crop is adversely affected by cold stress which is a common problem in the highland areas
of central East Africa (Uganda, Rwanda, north east Tanzania and Kenya) and Madagascar. Cold
stress is known to cause 26% to 80% yield loss. Currently, rice production in Uganda is mostly
growing to the low altitude areas as there is lack of cold-tolerant varieties that can grow in the
higher altitudes of the country. None of the released varieties in Uganda are tolerant cold. The
few cold-tolerant lines that have been identified are short-grain types, though Ugandan
consumers generally prefer long-grain size. This research aimed at identifying new sources of
cold tolerant rice genotypes with preferred traits. A total of 50 lines arranged in a 5x10 alpha
lattice design with two replications were used for both stressed and non-stressed experiments.
Twenty one (21) days old seedlings were stressed at 10oC in cold air for 10 days and the other
remained under normal ambient temperature. IRRI Standard Evaluation System (SES, 2013) was
used to score the effect of cold stress on leaf morphology (leaf wilting score) and on leaf color
(leaf yellowing score) after 7 day recovery. This study revealed eight highly cold tolerant
(SCRID091-20-2-2-4, GIZA 177, NERICA 1, MET P27, MET P23, MET P60, MET P20 and
MET P5) in which only GIZA 177 was short grain and fifteen tolerant varieties (MET P32, MET
P11, MET P2, MET P17, MET P3, MET P24, MET P16, MET P37, MET P18, MET P9, MET
P40, MET P31, MET P39, MET P22, MET P36) were identified.
Description
Keywords
Rice crop, Seedling growth, cold stress
Citation
Entele, K. T., Edema, R., Lamo, J., Tilahun, N., Abebe, D., & Kebede, W. (2022). Identification Of New Sources Of Rice Genotypes (Oryza Sativa L.) Tolerant To Cold Stress. https://doi.org/10.21203/rs.3.rs-1323214/v1