Premium
Contributions of Vegetative Growth Rate and Harvest Index to Grain Yield of Progenies from Avena sativa ✕ A. Sterilis Crosses 1
Author(s) -
Takeda K.,
Frey K. J.
Publication year - 1976
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1976.0011183x001600060020x
Subject(s) - biology , avena , backcrossing , heterosis , growth rate , yield (engineering) , agronomy , grain yield , interspecific competition , relative growth rate , zoology , horticulture , botany , hybrid , mathematics , biochemistry , materials science , geometry , metallurgy , gene
The relative importance of growth rate and harvest index in determining grain yield of oats was studied in various backcross generations of all possible matings between two strains of Avena sativa and eight collections of A. sterilis . Eight interspecific matings evaluated in 1972 showed maximum heterosis for growth rate in Bc 0 (original cross), whereas the eight tested in 1974 showed maximum heterosis for this trait in Bc 3 . Pooled correlations for growth rate and harvest index with grain yield were 0.76 and 0.54, respectively. The associations of harvest index and growth rate were nearly equal in Bc 0 , but with repeated backcrosses the association between growth rate and yield intensified, whereas that between harvest index and yield diminished. Variation for grain yield within backcross.mating combinations was determined almost completely by growth rate and harvest index (R 2 from 0.92 to 0.97). An increase of 0.1 g/day/plot (0.09 m 2 ) in growth rate gave the same grain yield improvement (14%) as a 4% increased in harvest index.