Morphological And Biochemical Variations In Adhatoda Types
By: Manjusha C M.
Contributor(s): Alice Kurian (Guide).
Material type:
BookPublisher: Vellanikkara Department of Plantation crops and spices, College of Horticulture 2001DDC classification: 633.8 Online resources: Click here to access online Dissertation note: MSc Abstract: A comparative evaluation of the morphological, histological and biochemical
features of various Adhatoda accessions collected from different parts of Kerala was
carried out in the Department of Plantation Crops and Spices, College of
Horticulture, Vellanikkara during 1998-2000 for characterizing the germplasm
accesions and to ascertain their species identity.
The 52 accessions after evaluating for their morphological characters were
classified into three clusters, which represented A.zeylanica (7types), A.beddomei
(20) and intermediate types (25). Key characters which served for distinguishing
between the two species were identified as plant habit, leaf size and shape, stomatal
distribution, streaks on corolla and pubescence of ovary. A.zeylanica types were
taller in habit with more number of branches, long petiole, broadly elliptic lanceolate
hypo stomatic leaves and white flowers with purplish streaks inside and large
pubescent ovary. A.beddomei types were small with lesser number of branches, short
petiole, narrowly elliptic lanceolate amphistomatic leaves, with white flowers
without purplish streaks inside and small glabrous ovary. Intermediate types showed
both the leaf and floral types emphasizing the possible occurrence of natural hybrids
in the genus. The variation in the elution pattern of phenols and terpenoids typical to
the species makes them to be effectively utilized in the biochemical characterization
of the species. A.zeylanica types showed a higher alkaloid content (0.66%)
compared to intermediate types (0.38-0.55%) and A.beddomei (0.27-0.32%).
Isozyme and enzyme studies also showed variation between accessions. However,
further trials involving more enzyme systems is necessary for characterization of
species.
High heritability (broad sense) accompanied with high genetic advance for leaf
area and petiole length indicates that most likely the heritability is due to additive
gene effects and selection based on such traits may be effective. The growth was
found progressive upto 12 MAP when it yielded more fresh and dry weights of whole
plant, leaf, stem and root compared to 6 MAP. A higher alkaloid content as well as
number of spots for phenols, terpenoids and alkaloids in the dry season compared to
wet season indicate the influence of moisture stress on accumulation of secondary
metabolites and the need for scheduling harvesting time coinciding with this season.
| Item type | Current location | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|
Theses
|
KAU Central Library, Thrissur Theses | 633.8 MAN/MO (Browse shelf) | Available | 171765 |
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MSc
A comparative evaluation of the morphological, histological and biochemical
features of various Adhatoda accessions collected from different parts of Kerala was
carried out in the Department of Plantation Crops and Spices, College of
Horticulture, Vellanikkara during 1998-2000 for characterizing the germplasm
accesions and to ascertain their species identity.
The 52 accessions after evaluating for their morphological characters were
classified into three clusters, which represented A.zeylanica (7types), A.beddomei
(20) and intermediate types (25). Key characters which served for distinguishing
between the two species were identified as plant habit, leaf size and shape, stomatal
distribution, streaks on corolla and pubescence of ovary. A.zeylanica types were
taller in habit with more number of branches, long petiole, broadly elliptic lanceolate
hypo stomatic leaves and white flowers with purplish streaks inside and large
pubescent ovary. A.beddomei types were small with lesser number of branches, short
petiole, narrowly elliptic lanceolate amphistomatic leaves, with white flowers
without purplish streaks inside and small glabrous ovary. Intermediate types showed
both the leaf and floral types emphasizing the possible occurrence of natural hybrids
in the genus. The variation in the elution pattern of phenols and terpenoids typical to
the species makes them to be effectively utilized in the biochemical characterization
of the species. A.zeylanica types showed a higher alkaloid content (0.66%)
compared to intermediate types (0.38-0.55%) and A.beddomei (0.27-0.32%).
Isozyme and enzyme studies also showed variation between accessions. However,
further trials involving more enzyme systems is necessary for characterization of
species.
High heritability (broad sense) accompanied with high genetic advance for leaf
area and petiole length indicates that most likely the heritability is due to additive
gene effects and selection based on such traits may be effective. The growth was
found progressive upto 12 MAP when it yielded more fresh and dry weights of whole
plant, leaf, stem and root compared to 6 MAP. A higher alkaloid content as well as
number of spots for phenols, terpenoids and alkaloids in the dry season compared to
wet season indicate the influence of moisture stress on accumulation of secondary
metabolites and the need for scheduling harvesting time coinciding with this season.
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