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Net photosynthesis and leaf resistance's in turgid sorghum leaves were compared with those of intact leaves which underwent relatively slow loss of water, and with excised leaves which lost water rapidly. Reduced net photosynthesis in intact leaves can largely be accounted for by stomatal closure; this is not so for excised leaves. Stomata of excised leaves both started and completed closure at much lower leaf water contents than those of attached leaves. [ABSTRACT FROM AUTHOR]

The mass spectra of a series of ortho, meta and para substituted isopropyl benzene derivatives have been determined where the second substituent is COOH, C(O)NH2, C(O)C6H5, C(Ph)(=NPh) or CH(Ph)(NHPh). Two bis-isopropylbenzophenones have also been studied. The spectra are characterized by prominent ortho effects which distinguish the ortho derivatives from the meta and para. [ABSTRACT FROM AUTHOR]

Exposure of whole sorghum plants to cold (5° C) or hot (30° C) nights, or exposure of shoots only to a range of low night temperatures (5-15° C) reduced both the rate and extent of stomatal opening during the succeeding day. Photosynthesis was correspondingly reduced. The reduction in the rate of stomatal opening could be attributed to a development of water deficits in the leaves. [ABSTRACT FROM AUTHOR]