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The small, methionine-rich chloroplast heat-shock protein protects photosystem II electron transport during heat stress

Author:
Heckathorn, S.A., Downs, C.A., Sharkey, T.D., Coleman, J.S.
Source:
Plant physiology 1998 v.116 no.1 pp. 439-444
ISSN:
0032-0889
Subject:
Solanum lycopersicum var. lycopersicum, heat stress, chloroplasts, protein composition, methionine, heat shock proteins, photosystem II, heat tolerance, acclimation, electron transfer, stress response
Abstract:
Evidence suggests that the small chloroplast heat-shock protein (Hsp) is involved in plant thermotolerance but its site of action is unknown. Functional disruption of this Hsp using anti-Hsp antibodies or addition of purified Hsp to chloroplasts indicated that (a) this Hsp protects thermolabile photosystem II and, consequently, whole-chain electron transport during heat stress; and (b) this Hsp completely accounted for heat acclimation of electron transport in pre-heat-stressed plants. Therefore, this Hsp is a major adaptation to acute heat stress in plants.
Agid:
665421