The small, methionine-rich chloroplast heat-shock protein protects photosystem II electron transport during heat stress.
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.
Heckathorn
S A
SA
Department of Biology, Syracuse University, New York 13244-1220, USA. heckathorns@cofc.edu
Downs
C A
CA
Sharkey
T D
TD
Coleman
J S
JS
D000064:Acclimatization; D002736:Chloroplasts / Q000502:physiology*; D004579:Electron Transport; D006360:Heat-Shock Proteins / Q000096:biosynthesis / Q000302:isolation & purification / Q000502:physiology*; D006358:Hot Temperature; D018551:Solanum lycopersicum / Q000502:physiology*; D008715:Methionine; D045322:Photosynthetic Reaction Center Complex Proteins / Q000378:metabolism*; D045332:Photosystem II Protein Complex; D013997:Time Factors
D006360:Heat-Shock Proteins; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex; D008715:Methionine