Distribution between parts of the main shoot and the tillers of photosynthate produced before and after anthesis in the top three leaves of main shoots of Hobbit and Maris Huntsman winter wheat

Thorne, G.N.

Annals of Applied Biology 101(3): 553-559

1982


ISSN/ISBN: 0003-4746
DOI: 10.1111/j.1744-7348.1982.tb00858.x
Accession: 001064037

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Abstract
The top 3 leaves of main shoots in crops of winter wheat cv. Hobbit and Maris Huntsman were exposed to 14CO2 at 22 and 16 days before and at 10 days after anthesis in 1978. The distribution of the 14C recovered in whole plants at anthesis and at maturity was measured. There was negligible loss of 14C between these 2 times, but some redistribution. The percentage in the tillers was negligible when the flag leaf (leaf 1) was exposed to 14CO2, and otherwise <12% except for 14C absorbed by the 3rd leaf at 16 days before anthesis, when it averaged 26% but was very variable. When 14C was supplied before anthesis, c. 20% reached the grain whichever leaf had been supplied. The ear structures contained c. 10% of that absorbed by the 3rd leaf and 35% of that absorbed by the flag or 2nd leaf. When 14C was supplied after anthesis, the amounts reaching the grain from the different leaves were: flag 82%, 2nd 68%, 3rd 56%. Most of the remainder was in the stem. The exposed leaf never retained >6%. The amount of 14C that moved from the stem to the grain between anthesis and maturity was c. 50% greater in Hobbit than in Maris Huntsman. There was no significant varietal difference in the percentage of post-anthesis 14C reaching the grain. The ear structures of Hobbit contained c. 33% more 14C than those of Maris Huntsman. An additional 90 kg N/ha, which increased grain yield by 46%, had negligible effects on the distribution of 14C.

Distribution between parts of the main shoot and the tillers of photosynthate produced before and after anthesis in the top three leaves of main shoots of Hobbit and Maris Huntsman winter wheat