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P. B. Kavi Kishor, S. Sangam, R. N. Amrutha, P. S. Laxmi, K. R. Naidu, K. R. S. S. Rao, S. Rao, K. J. Reddy, P. Theriappan, N. Sreenivasulu, “Regulation of Proline Biosynthesis, Degradation, Uptake and Transport in Higher Plants: Its Implications in Plant Growth and Abiotic Stress Tolerance,” Current Science, Vol. 88, No. 3, 2005, pp. 424-438.

has been cited by the following article:

• TITLE: Responses of Transgenic Tobacco Plants with Increased Proline Content to Drought and/or Heat Stress

  AUTHORS: Jana Pospisilova, Daniel Haisel, Radomira Vankova

  KEYWORDS: Carotenoids, Chlorophyll, Net Photosynthetic Rate, Stomatal Conductance, Transpiration Rate, Xanthophyll Cycle Pigments

  JOURNAL NAME: American Journal of Plant Sciences, Vol.2 No.3, September 30, 2011

  ABSTRACT: Transgenic tobacco plants (M51-1) constitutively over-expressing a modified gene for the proline biosynthetic enzyme △2-pyrroline-5-carboxylate synthetase (P5CSF129A) and the corresponding wild-type plants (WT) were compared during drought or heat stress and under combination of both stresses. The proline content in M51-1 was several times higher than in WT plants. Under optimal conditions, the transpiration rate and stomatal conductance of M51-1 plants were lower than those in WT plants. The differences in net photosynthetic rate were not significant and water use efficiency and contents of chlorophyll and xanthophyll cycle pigments were higher in M51-1 than in WT plants. Drought induced by cessation of watering for 7 d resulted in decrease of all gas exchange parameters and chlorophyll content, but in an increase of the content of xanthophyll cycle pigments and degree of their de-epoxidation. After application of heat stress (40°C/60 min) to control or water-stressed plants the gas exchange parameters decreased considerably. Short-term heat stress alone, however, did not affect pigment contents. The responses of M51-1 and WT plants to the tested stresses did not differ significantly. Therefore, a decisive contribution of elevated proline content to drought or heat stress tolerance of tobacco was not proved.