Interacting effects of light and day and night temperatures on the growth of four species in the vegetative phase | Interacting effects of light and day and night temperatures on the growth of four species in the vegetative phase [Cotton, sunflowers, maize, kidney beans]
1975
Rajan, A.K. | Blackman, G.E.
A comparative examination has been made under controlled conditions of the interacting effects on growth in the vegetative phase which takes place when the diurnal temperature is either maintained constant at 20 and 25 °C or reduced at night by 5 and 10 °C and the plants subjected daily to either 2.16 or 4.32 × 10(4) lx for 14 h. For each species (Gossypium hirsutum, Hclianthus annuus, Phaseolus vulgaris and Zea mays) the changes in net assimilation rate, the leaf area ratio and the relative growth rates in plant weight and leaf area were recorded. Contrary to some previous findings, none of these components of growth are favoured by cool nights. Rather such reductions in temperature retard the growth processes to a varying degree according to the species and the component. In general, significant reductions are more evident for the two relative growth rates when a drop from 20 to 10 °C is combined with the lower level of illumination. The implications of these results are considered in relation to a prior study where for similar light conditions the same species plants were subjected to constant temperatures ranging from 10 to 25 °C.
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