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Reproductive biology of rohida (Tecomella undulata (Sm) seem.)

KrishiKosh

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Title Reproductive biology of rohida (Tecomella undulata (Sm) seem.)
 
Creator Praveen
 
Contributor Bangarwa, K.S.
 
Subject Sowing, Developmental stages, Germinability, Budding, Storage, Biological phenomena, Sets, Fruits, Genetics, Paper
 
Description The present study entitled “Reproductive biology of Rohida (Tecomella undulata (Sm)
Seem.)” was conducted on naturally growing trees of Rohida at Balsamand (Hisar), Department of
Forestry and in laboratory of Department of Seed Science and Technology and Department of Forestry,
CCS Haryana Agricultural University, Hisar. Large bisexual flowers of red, orange and yellow colour
started to emerge out with starting of spring season. The bud initiation started in last week of February
and the flowering continued up-to third week of May. The flowering pattern showed a low rate initially
during February gradually increasing to peak during mid-March and April followed cessation during
end of April in some trees and decline in others. Flower development was divisible into five distinct
stages. The average duration of flowering was 54.5 days. The flower bud took 15.5-19.5 days to come
to bloom. Average time taken from stage I – II was 16.40 days while IV –V was 0.10 days. It was
found that 40.99 to 47.38 days were required from bud initiation to fruit maturity. Flower anthesis was
observed between 05.00 AM -01.00 PM with peak between 07.00 A.M. to 10.00 A.M.
There was almost invariably no pod setting from May end onwards. It could be established
that Rohida is strictly cross-fertilizing species. The considerable amount (5.55%) of fruit setting in
open natural pollination (having many trees of Rohida in a close vicinity) and no fruit setting in selfing
as well as negligible fruit setting (0.14%) on isolated tree has undoubtedly confirms the cross
pollinated nature of Rohida. The large flower size and sufficient amount of nectar present in the flower
also hinted towards the entomophilous nature. Maximum fruit setting took place from March to April.
Pods were dark brown in colour with various shape curved or elongated. Pod and seed characters were
recorded at the time of collection of seeds in order to study the extent of phenotypic variation in natural
population. Pod length and No. of seeds per pod also showed significant variability. Pod length varies
from 17.9 cm to 63.9 cm, while No. of seeds per pod varied from 67 to 218.
Sufficient pods were collected from each of the ten randomly selected trees of Rohida. It could
be established that top of paper at 25ºC has maximum germination of seeds of Rohida. The germination
percent in fresh seed was observed from 54.67 to 69.33 % with an average of 62.13%, whereas the
germination percent after six months of storage was observed from 10.67% to 20.00% with an average
of 14.67%. Paired t-test showed significant loss in germination percent, Vigour Index-I, Vigour Index-
II and Tetrazolium test after 6 months of storages. Vigour Index-I and Vigour Index-II reduced from
507.50 to 111.34 and 21360.03 to 4791.58 respectively. Loss of germination and reduction in vigour I,
vigour index II and tetrazolium test was highly significant and very high. Non significant decrease was
observed in seedling length and seedling dry weight after six months of storage which suggested that
reduction in vigour index I and vigour index II was due to loss in germination percent and not because
of seedling length and seedling dry weight respectively. These results suggested that six months after
storage, quality planting stock can be produced by increasing the seed rate.
 
Date 2016-10-05T09:21:35Z
2016-10-05T09:21:35Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/79941
 
Language en
 
Format application/pdf
 
Publisher CCSHAU