Development of photochemical activity during greening of heat-stressed etiolated seedlings of Zea mays

Lawanson, A. A.

doi:10.1007/bf02124065

Cited by 1 publication

(2 citation statements)

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“…It is therefore believed that the total number of chloroplasts per leaf was reduced by the high-temperature treatments. It can thus be concluded that the decreased yield of heat-stressed seedlings reported above is attributable, at least in part, to the reduction in rates of chloroplast function previously reported (Onwueme & Lawanson, 1973, 1975Lawanson & Onwueme, 1973;Lawanson, 1976Lawanson, , 1977, and to the heat-induced reduction in leaf size and number of chloroplasts reported herein.…”

Section: Discussionsupporting

confidence: 59%

“…In previous communications we have shown that when etiolated seedlings were subjected to non-lethal high temperatures, the rates of chloroplast function were retarded, e.g. formation of chlorophyll (Onwueme & Lawanson, 1973, 1975 and of protochlorophyll (Lawanson & Onwueme, 1973), cyclic photophosphorylation with phenazine methosulphate, and ATP hydrolysis (Lawanson, 1976) and non-cyclic photophosphorylation with ferricyanide, and reduction of ferricyanide (Lawanson, 1977). In the studies enumerated above, formation of chlorophyll and protochlorophyll was determined on the basis of unit weight of dry plant tissue while photosynthetic activity was measured on the basis of unit weight of chlorophyll.…”

Section: Introductionmentioning

confidence: 99%

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Heat-induced changes in dry weight, leaf size and number of chloroplasts per cell in maize and cowpea shoots

Adelusi

Lawanson

1978

J. Agric. Sci.

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When etiolated seedlings of maize and cowpea were subjected to a heat stress of 45 °C for 8 h and subsequently illuminated, there was a retardation in the rates of leaf elongation and chloroplast formation, but the rate of increase in dry weight was not affected. However, a heat stress of 45 °C for 16 h decreased all the three rates measured, the effects being more pronounced with the longer duration of stress in the case of leaf elongation and chloroplast formation. The cowpea seedlings were more sensitive to heat than the maize seedlings. The decreased yield (dry weight) in the 16 h treatment was due, at least partly, to the heat-induced retardation of the growth of the photosynthetic apparatus.

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Section: Discussionsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%