Heat‐shock proteins and cross‐tolerance in plants

Abstract

Environmental stresses dramatically affect plant survival and productivity. Because plants are immobile, presumably different strategies are required for protection against transient stresses. Under stress, plants synthesize specific proteins, and their accumulation has a role in protecting the tissue from possible damage. An increasing number of studies show the existence of cross‐tolerance in plants: Exposure of tissue to moderate stress conditions often induces resistance to other stresses. Many varied mechanisms explaining the phenomenon of cross‐tolerance have been proposed, and they often, but not always, suggest that specific proteins are induced by one kind of stress and are involved in the protection against other kinds. Although various cross‐protections have been demonstrated in a number of plants, a common mechanism has not been found. This review discusses heat‐shock proteins and their possible roles in protecting the plant under heat and other stresses.

Respons tanaman kelapa sawit (Elaeis guineensis Jacq) terhadap cekaman kekeringan Respons of oil palm (Elaeis guineensis Jacq) to water stress

“…Hal ini dibuktikan pada tanaman Populus yang lebih toleran terhadap cekaman kekeringan menginduksi protein lebih banyak dibandingkan dengan yang kurang toleran Pada tanaman yang toleran terjadi induksi protein baru sekitar 60 kDa dengan konsentrasi yang sangat tinggi setelah tanaman dicekam kekeringan, sedang pada tanaman kontrol protein tersebut tidak ditemukan. Sabehat et al (1998), Viestra (1993 dan Pelah et al (1997) menyatakan bahwa umumnya ditemukan adanya peningkatan akumulasi protein dengan bobot molekul rendah apabila tanaman mengalami cekaman kekeringan. Namun, secara umum protein total mengalami penurunan.…”

Response of maize inbred lines to a defoliation treatment inducing tolerance to cold at germination

“…Even if cold tolerance at germination is a polygenic trait (Eagles, 1982;Eagles, 1988;Landi et al, 1992;Kollipara et al, 2002), the identification of major genes responsible for cold tolerance and cold-acclimation would provide a potential new information, which could be usefully integrated in conventional plant breeding (Thomashow, 1999). Studies of the tolerance to different stresses suggest that they may have a common genetic base (Sabehat et al, 1998;Pastori & Foyer, 2002), as in the case of desiccation and freezing tolerance, where exposure to desiccation stress improves tolerance to freezing (Huitema et al, 1982;Vigh et al, 1986). There are different cases in which a reaction to a type of stress can induce tolerance to another type, such as wounding, dehydration, low temperature and pest attack (McIntosh et al, 1998;Shinozaki & Yamaguchi-Shinozaki, 2000).…”

Cross Adaptation Tolerance in Rice Seedlings Exposed to PEG Induced Salinity and Drought Stress

“…Plants often produce tolerance to subsequent other stresses"crossadaptation" when early exposed to moderate stress (Boussiba et al, 1975). The plant genome regulated the adaptive process and specific proteins induced by first stress protect against sequential stress in case of cross-adaptation (Sabehat et al, 1998). Furthermore, pre-treatment plants could keep the adaptability during the growth period (Cuartero et al, 2006).…”