Internodal elongation: A potential screening technique for heat tolerance in potato |
| |
Authors: | Shantha Nagarajan Joginder Singh Minhas |
| |
Institution: | (1) Division of Crop Physiology and Bio-chemistry, Central Potato Research Institute, 171001 Shimla, India;(2) Present address: Regional Station, Agricultural Research Institute, 132001 Karnal, India |
| |
Abstract: | Summary In pot culture experiments over 2 consecutive years, 20 potato genotypes of varying heat tolerance were grown under long day
conditions and heat stressed by being exposed to high (38 °C/21 °C mean day/night) temperature. The percent increase in mean
internode length of heat stressed plants over those grown at normal temperatue (25°C/16°C day/night) was correlated with the
percent tuber dry matter yield of the heat stressed plants (r=0.618, P=0.01). In the same 20 genotypes, grown under short
day conditions at normal temperature, the fraction of leaf bud cuttings exposed to high night temperature (23°C) that produced
tuber initials correlated with the percentage increase in internode elongation in stem cuttings exposed to 25°C compared with
those exposed to 15°C (r=0.680. P=0.01). Thus the relative changes in internode elongation are related to thermal tolerance,
and it is suggested that this can be used as a selection criterion for heat tolerance. |
| |
Keywords: | Heat stress Leaf bud cutting Solanum tuberosum L |
本文献已被 SpringerLink 等数据库收录! |
|