Effects of decreasing the number of grains in ears of cultivars hobbit and maris huntsman winter wheat triticum aestivum

Radley, M.E.; Thorne, G.N.

Annals of Applied Biology 98(1): 149-156

1981


ISSN/ISBN: 0003-4746
DOI: 10.1111/j.1744-7348.1981.tb00432.x
Accession: 005298423

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Abstract
At 6 days after anthesis, grain numbers in ears of 'Maris Huntsman' and 'Hobbit' winter wheat growing in the field were decreased either by removing the 2 lower grains in each spikelet (degraining) or by removing the top half of the ear (halving). At maturity, degraining increased the dry weight of the third grains in each spikelet of 'Maris Huntsman' by 11% and of 'Hobbit' by 40%, compared with 3rd grains in intact ears. Halving increased the mean dry weight of all the grains in the lower 6 spkelets of the ear slightly less; it increased the number of grains in 'Hobbit' but not in the 'Maris Huntsman'. The responses to halving in 'Hobbit' were greater with additional N fertilizer. At 28 days after anthesis in both varieties, degraining increased grain dry weight and the amount of water, reducing sugar, amino acids and total N in 3rd grains. Effects of halving on these properties of the 2 lower grains of each spikelet were much less or nil. The increases in N content of grains at 28 days and at maturity caused by degraining or halving were relatively greater than the increases in dry weight, and were similar in the 2 varieties.

Effects of decreasing the number of grains in ears of cultivars hobbit and maris huntsman winter wheat triticum aestivum