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1999 (1)
1Author    Sergi Munné-Bosch3, Karin Schwarz, Leonor Alegre3Requires cookie*
 Title    in Rosmarinus officinalis L. and Melissa officinalis L  
 Abstract    Summer diurnal variations of photosynthesis and a-tocopherol content were measured in relation to natural drought in field-grown rosemary (Rosmarinus officinalis L.) and lemon balm (Melissa officinalis L.) plants. During the summer relative water contents (RW C) of ca. 40% in Rosmarinus officinalis and ca. 30% in Melissa officinalis were attained, indicating severe drought. Both species showed similar diurnal patterns of net C 0 2 assimilation rates (A) with a wide plateau of maximum photosynthesis at midday in the absence of drought and one peak of maximum photosynthesis early in the morning under drought conditions. Net C 0 2 assimilation rates decreased by ca. 75% due to drought in both species. Melissa officinalis plants showed a significant decrease in the relative quantum efficiency of PSII photochemistry (4>psn), ratio of variable to maximum fluorescence yield (F J F m) and chloro­ phyll content of leaves by ca. 25% under drought conditions at midday. In contrast, cJ)pSI1, F J F m and chlorophyll content remained constant throughout the experiment in R. officinalis plants. Although the non-photochemical quenching of chlorophyll fluorescence increased from ca. 1.8 to 3 and the a-tocopherol content rose fifteen fold in both species in response to drought, only R. officinalis plants were able to avoid oxidative damage under drought conditions by the joint increase of carotenoids and a-tocopherol. 
  Reference    Z. Naturforsch. 54c, 698—7 (1999); received November 17 1998/March 20. 1999 
  Published    1999 
  Keywords    a-Tocopherol, Photosynthesis, Drought, Rosmarinus officinalis, Melissa officinalis 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0698.pdf 
 Identifier    ZNC-1999-54c-0698 
 Volume    54