Two teak (Tectona grandis L.f.) phenotypes differing in their leaf length/breadth ratios were subjected to water stress by withholding water supply for three weeks. Growth rates of whole plants, developing leaves (1st and 2nd from shoot apices), and 2nd and 3rd internodes were higher in broad leaved (BL) phenotype than in narrow leaved (NL) phenotype before and after imposing water stress treatment. However, the effect of water stress on these parameters was higher in the BL phenotype than in the NL one. Diurnal course of net photosynthetic rate (PN) of 3rd or 4th leaves from shoot apices measured under well-watered conditions was higher for the NL than BL phenotype. PN, stomatal conductance (gs), and transpiration rate (E) in both phenotypes were negatively affected by water stress and their decline under water stress was significantly higher in the BL than NL plants. and G. Rajendrudu, C. V. Naidu, K. Mallikarjuna.
Cadmium (Cd) treatments caused an inhibition in the net photosynthetic rate (PN) of peanut (Arachis hypogaea) plants, due to the reduction of stomatal conductance (gs) and photosynthetic pigment contents, as well as the alteration in leaf structure. The decrease of the transpiration rate and gs might result from the Cd-induced xerophyte anatomic features of leaves (i.e. thick lamina, upper epidermis, palisade mesophyll, high palisade to spongy thickness ratio, as well as abundant and small stomata). The decline of PN was independent of the impairment in photosystem 2. and G. R. Shi, Q. S. Cai.