Photosynthesis, respiration, cell leakage and phospholipid property of japonica and indica X japonica rice cultivars

Kwon, Y.W.; Soh, C.H.

Plant Physiology 75(1, Suppl): 116


ISSN/ISBN: 0032-0889
Accession: 001233854

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Two cultivars each of chilling-tolerant japonica (J) and indica X japonica (I X J) were studied. Phospholipids of leaf and root tissue of J showed more unsaturation than those of I X J, leaf phospholipids being less saturated than root phospholipids in both cases. Tocopherol tagged liposomes made of leaf and root phospholipid showed phase transition at 10 and 11.2 degrees C in J and 17.2 and 17.5 degrees C in I X J. Electrolyte leakage from leaves and roots increased abruptly below 4 degrees C in J and below 8 degrees C in I X J. Phase transition of the Hill activity occurred at 7 degrees C in J and 10 degrees C in I X J. Respiratory activity of leaf discs or mitochondria showed phase transition at 17 and 15 degrees C in J and 15 degrees C in I X J; that of roots showed phase transition at 20 and 15 degrees C in both J and I X J. Decrease in respiration below the first phase transition temperature was much greater in J than in I X J. These results indicate that root respiration is more important than leaf respiration, photosynthesis or phospholipid composition in varietal differences in cold tolerance.