The Change of Photosynthetic Activity and the Varietal Difference in the Ripening of Tobacco

Miyazaki, Tokuzo; Tatemichi, Yoshiro

doi:10.1626/jcs.37.135

Cited by 2 publications

(1 citation statement)

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“…Firstly, there is a decrease in the overall enzymatic capacity for photosynthesis (Smillie 1962) and of the enzyme carboxydismutase (Woolhouse 1967). Secondly, in aging leaves P N is correlated with RNA and protein content (Hardwick, Wood, and Woolhouse 1968), with protein metabolism (Richardson 1957;Rhodes and Yemm 1963), and with protein nitrogen content (Miyazaki and Tatemichi 1968;Tatemichi 1968). Furthermore, kinin analogues which prevent net protein breakdown also prevent the decline in P N with age (Natr 1967).…”

Section: (B) Differences Between Leaves On the Same Plantmentioning

confidence: 99%

Photosynthesis of Tropical Pasture Plants III. Leaf Age

Ludlow¹,

Wilson²

1971

Aust. Jnl. Of Bio. Sci.

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AbstmctGrass and legume plants were grown under near-optimum conditions in controlled-environment cabinets. Changes in net photosynthetic rate, dark respiration rate, and carbon dioxide transfer resistances during leaf ontogeny, and variability between leaves on grass tillers and legume runners were studied under controlled conditions in an open gas analysis system.As leaves aged dark respiration rate, light compensation point, and light saturation point declined progressively, whereas the initial slope of the light response curve and net photosynthetic rate measured at 10,000 f.c. increased to a maximum before declining. Immediately after unfolding, grass leaves photosynthesized at a rate more closely approximating the maximum than legume leaves which had a relatively low rate initially. For both grasses and legumes, the lower photosynthetic rate of young leaves was accompanied by high mesophyll resistances, but the decline from the maximum rate as leaves aged was associated with increases in both stomatal and mesophyll resistances. Stomatal resistance exerted a major control over the net photosynthetic rate of grasses, whereas mesophyll resistance predominated for legumes.The influence of chlorophyll concentration_ on the relationship between net photosynthesis and leaf age is discussed.

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