Adaptation of photosynthetic electron-transport rate to growth temperature in pea.

摘要: Pea (Pisum sativum L. cv. Feltham First) plants were germinated and grown under two temperature regimes, one chilling (6-8° C) non-chilling (16-18° C), which are referred to as "cold-grown" "warm-grown", respectively. It was found that: (1) At saturating light intensity with excess CO2, cold-grown leaves exhibited faster rates of oxygen evolution than warm-grown when measured below 15° C. However measurements carried out above this temperature, the reverse relationship observed. (2) Full-chain electron-transport on thylakoids showed that those isolated from had greater light-saturated uncoupled their equivalents at all temperatures between 3 19° (3) This difference apparently not due a activity photosystem I or II in plants, but rather more rapid turnover dark step within chain. These results interpreted terms previously reported apparent homeoviscous adaptation pea thylakoid membrane growth (J. Barber, R.C. Ford, R.A.C. Mitchell, P.A. Millner, 1984, Planta 161, 375-380).