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《Acta Agronomica Sinica》 1981-01
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STUDIES OF THE INFLUENCE OF THE EARLY-SENESCENCE OF WHEAT LEAVES ON THE GRAIN YIELD WITH ~(14)CO_2 AS A TRACER

Huang Zhiren Gong Jian Eeng Furu (Jiangsu Agricultural College)  
Results obtained from preliminarily studies indicated that the three uppermost leaves of the early-senescent lines died 4-8 days earlier than those of the normal varieties of wheat.This phenomenonwas especially serious with the 2nd and 3rd leaves from the top.In early-senescent lines,the totalamount of assimilates distributed to the grains from ears and leaves decreased by 5% at flowering timeand in 10 days after flowering as compared with that in normal lines;and the outflow efficiency ofassimilates from ears and the uppermost 2nd and 3rd leaves was 4-23% lower than that of normallines,but the amount remained was 2-12% higher.As distinguished from normal lines,the outflowefficiency of the flag leaf of the earlysenescent lines increased by 2-9%.Owing to the early-senescence of leaves,the grain yield lose reached about 5-6% in 20 days afterflowering.It is significant,therefore,in breeding practice that strains which didnot gave sigus ofearly-senescence at later stage should be selected.In order that the functional period of the upper lea-ves could be prolonged and the grain weight could be increased,special attention should be paid tothe application of fertilizers for ear and grain formation.
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