MORPHOLOGICAL CHARACTERIZATION OF POTATO (Solanum tuberosum L.) GENOTYPES FOR YIELD ATTRIBUTING TRAITS UNDER LONG DAY CONDITION
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Date
2022
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DRPCAU, PUSA
Abstract
A research was performed out entitled “Morphological characterization of
potato (Solanum tuberosum L.) genotypes for yield attributing traits under long
day condition” at the Potato research farm Tirhut College of Agriculture, Dholi,
Bihar, during Rabi 2021-2022, to assess the potato genotypes under artificially
created extended photoperiod condition. 25 genotypes with Randomized Complete
Block Design and 3 replications of the lines were set up in extended photoperiod.
Variability, genetic advance, inter-trait association, path analysis, diversity analysis
for yield attributing traits and identification of flowering genotypes under extended
photoperiod condition at Dholi were investigated.
Analysis of variance in this circumstance showed considerable variations
amongst the lines for all the yield attributing characters under investigation. High
value of GCV and PCV were observed for the parameters like; number of shoots per
plant (NSPP), number of tubers per plant (NTPP) and marketable tuber yield (MTY)
indicated more variation and more chances of effective selection compared to other
studied traits under long day condition. The traits like number of shoots per plant
(NSPP), number of compound leaves per plant (NCLP), number of tubers per plant
(NTPP), yield per plant (YPP), marketable tuber yield (MTY), unmarketable tuber
yield (UMTY) and total tuber yield (TTY) manifested high heritability coupled with
high genetic advance as percent of mean.
The characters such as marketable tuber yield (MTY), yield per plant (YPP),
tuber dry matter (TDM), unmarketable tuber yield (UMTY), number of compound
leaves per plant (NCLP), plant height (PH) and number of tubers per plant (NTPP)
were of prime importance in the process of selection for yield improvement, as they
showed positive association with total tuber yield and a positive direct effect on the
yield and also all other traits gave indirect contribution to the yield through these
traits.
25 lines were distinguished into eight clusters in extended photoperiod sown
scenario. In this scenario between clusters IV and VIII highest inter cluster distance
was reported, followed by cluster V and cluster VII, cluster IV and cluster VI.
Minimum inter-cluster distance measured between cluster III and cluster V. Clusters
II, III, V, VI and VIII were monogenotypic clusters. The highest intra-cluster D2 value
was found in cluster IV, followed by clusters I and VII under long day scenario.
Maximum contribution to total genetic diversity was recorded for number of tubers
per plant (NTPP) demonstrating that genotypes for the aforementioned characteristic
greatly differ genetically from one another. Genotypes such as K. Garima and K.
Pukhraj from cluster IV can be employed as donor parent in a hybridization
programme to increase potato yield under extended photoperiod condition.
Under this condition eighteen out of the twenty five genotypes flowering
characteristics were developed viz: Atlantic, P-56, K. Himsona, K. Lalit, K. Mohan,
K. Lalima, CP-4404, K. Frysona, K. Chipsona-3, J-15-2, K. Khyati, K.Chipsona-1, K.
Garima, K. Pukhraj, K. Shailja, K. Arun, K. Pushkar and K. Manik.