The aim of our work is to study gas exchange and antioxidant system in nine wild solanaceous species Solanum indicum, Solanum macrocarpon, Solanum acculeatissimum, Solanum sysimbrifolium, Solanum nigrum, Solanum viarum, Solanum insimum Solanum torvum, and Solanum macranthum under water logging condition. Experiments were laid in factorial completely randomized design with three replications. Photosynthesis and stomatal conductance decreased and closure of stomata was quick during flooding conditions in all the Solanum species. Species Solanum torvum performed photosynthetically better under flooding and also had better stomatal conductance. The antioxidants like SOD, catalase and peroxidase activity was significantly increased during the period of waterlogging and lipid peroxidation (MDA) content was decreased in tolerant Solanum species. An increase in the some parameters associated with oxidative stress, namely peroxides production, lipid peroxidation, and electrolyte leakage, reveals that root oxygen deficiency caused photooxidative damage in all rootstocks of solanaceous species. The ability to maintain a balance between the formation and detoxification of activated oxygen species appeared likely to increase the survival potential and the tolerance of the plants against varying oxidative stress. On basis of our observation, we conclude that species with higher photosynthetic rate and antioxidant system had improved waterlogging stress tolerance.

to assess the performance of 39 monoecious cucumber land races. Number of primary branches were more in the local type Vennamuthupatti local (7.33) and the number of male flowers per plant was minimum in Amaravathi local (38.33). The maximum number of female flowers per plant was recorded in Periyakullappatti local (33.67). Number of fruits per plant was highest in Sankagiri local(11.20). Fruit length ranged from 12.62cm (Musiri local) to 54.83cm (Amaravati local). The fruit girth was lowest in Upilipalayam local (13.2 cm) which produced a slender fruit. Musiri local recorded a high fruit weight (1.65 kg). The maximum yield of 14.77kg/ plant was registered in Sathur local.

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