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Heterotic response and combining ability in oats (Avena spp.)

KrishiKosh

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Title Heterotic response and combining ability in oats (Avena spp.)
 
Creator Mishra, Pratiksha
 
Contributor Arora, Ram Nath
 
Subject Heterosis, Crossing over, Developmental stages, Biological phenomena, Hybrids, Oats, Yields, Sugar, Sowing, Planting
 
Description The present investigation was carried out with the objective of finding out heterotic
patterns among 21 crosses between 7 parents for various traits. Morphological characters included
days to flowering, days to maturity, plant height at maturity, flag leaf length, stem inter-node
length, tillers per plant, peduncle length, axis length, number of spikelet per panicle, seed
yield/plant and 100 seed weight, whereas, biochemical/quality parameters include crude protein of
grain, fat content, and total soluble sugar including reducing sugars and non- reducing sugar and
physiological parameters include photosynthetic rate, transpiration rate and stomatal conductance.
Higher GCV values for stomatal conductance, transpiration rate and non-reducing sugars and
moderate values for tillers/plant and SI indicated that variability is not a constraint to improve
these traits because heritability values for each trait was also very high. Analysis of variance for
combining ability indicated that both gca and sca were also significant. The ratio between gca and
sca was more than one for axis length and flag leaf length. For other traits it was less than one
indicating that sca was more important than gca for these traits. Plant height was the only trait that
showed heterosis in negative direction coupled with more dwarf F1s that the most dwarf parent A.
sterilis. Therefore, Avena sterilis can be a good donor for reduced height gene in oats. For the
quality parameters like protein content, fat content, total soluble sugar, reducing sugar and non
reducing sugar the best crosses identified were; HJ8 x UPO212 and HJ8 x OS346, for protein
content. HJ8 x A. sterilis and HJ8 x UPO212, for fat content; HJ8 x OS6 for total soluble sugar;
HJ8 x A. sterilis, UPO212 x A. sterilis, for reducing sugar and HJ8 x OS6, for non reducing
sugars all these crosses showed positive significant heterosis over mid parent and/or better parent
and/or best check variety. Based upon per se performance for 19 traits studied HJ8 was a good
donor for 6 traits namely axis length, tillers/plant, spikelets/panicle, photosynthetic rate,
transpiration rate and stomatal conductance followed by OS346 which was superior for other five
traits namely peduncle length, flag leaf length, 100 seed weight, total soluble sugar and seed yield.
This was followed by A. sterilis showing superiority for plant height, protein content, non
reducing sugar and days to maturity. The Kent x OL125 was best for photosynthetic rate and days
to maturity; Kent x UPO212, for tillers/plant and seed yield; Kent x OS346 for plant height;
Kent x A. sterilis for axis length; HJ8 x OL125 for reducing sugar; HJ8 x OS346 for protein
content; HJ8 x A. sterilis for spikelets/panicle and fat content; OS6 x OL125 for peduncle length;
OS6 x UPO212 for internode length; UPO212 x OS346 for stomatal conductance and days to
flowering and UPO212 x A. sterilis for transpiration rate. Nine of the 21 crosses and 2 of the 7
parents did not shown superiority for any of the nineteen traits studied.
 
Date 2016-10-29T08:35:17Z
2016-10-29T08:35:17Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/82870
 
Language en
 
Format application/pdf
 
Publisher CCSHAU