Volume 99, Issue 2
April 1989, pages 83-163
pp 83-90 April 1989
Two taxa ofCololejeunea subgenusPedinolejeunea are discovered from south India.Cololejeunea cardiocarpa (Mont.) Steph. is being described for the first time from India andCololejeunea foliicola is proposed as a new taxon. The former is a facultative foliicolous taxon characterized by ovate-triangular leaves with apical finger-like hyaline cells, inflated lobules with 2-celled first tooth and basal hyaline papilla, whereas the latter (Cololejeunea foliicola) is obligatory foliicolous and characterized by oblong leaves with marginal rectangular hyaline cells and variable (ligulate-inflated) divergent lobules.Cololejeunea cardiocarpa is monoecious (paroecious and synoecious) whereasCololejeunea foliicola is dioecious.
pp 91-95 April 1989
In bothConvallaria andTheropogon, the tepals and stamens are one-traced. The placentation is morphologically and anatomically parietal.Convallaria has no floral nectary.Theropogon has it ovarian. Affinities of the tribe with the Polygonateae are indicated. Cronquist’s association of the seggregate families of the lilies under a larger alliance is thought to be more plausible.
pp 97-105 April 1989
An organographic survey of floral trichomes along with their distribution, ontogeny, systematic and functional significance has been presented inTabebuia rosea DC,Millingtonia hortensis Linn.,Dolichandrone falcata Seem,Jacaranda mimosaefolia D Don andStereospermum chelonoides DC of Bignoniaceae.
Four types of glandular and two of non-glandular trichomes have been recognised. Ontogenetically the different types of glandular trichomes mainly differ in the pattern of divisions in the head cells and their subsequent differentiation. The richness of total proteins of the heads of some of these suggests them to serve the function of lubrication during gliding growth of floral parts in bud condition.
pp 107-115 April 1989
Garcinia exhibits a remarkable diversity in the morphology of androecium and pollen. Four androecial and 8 pollen types have been recognised. The correlation of androecial and pollen character states indicate 3-longicolporate, reticulate and medium sized pollen as basic, and other types as derived. Similarly, the stamens on a well developed floral axis are considered as primitive, and other types as derived. On the basis of geographical distribution of the different character states, it is presumed that the genusGarcinia may have originated when the land-masses were together and diversified later at two centres—Afro-Madagascar and Indo-Malaysia after the separation of land-masses.
pp 117-126 April 1989
Morni hills which form a part of Siwaliks are located in north-east Haryana (30° 35′ to 34° 45′N and 70° 00′ to 75° 15′E) at an altitude of 1000 to 1200 m above the mean sea level. Vegetation analysis was undertaken in 3 forest types, i.e.Pinus roxburghii, mixed-deciduous forest and scrub.Anogeissus latifolia andLannea coromandelica were the dominant tree species in the mixed forest.Pinus roxburghii forest was monospecific andFlacourtia indica was dominant in scrub. Bioedaphic conditions influenced the performance of tree and shrub species, density of seedlings and saplings and herb layer composition. The density of trees in mixed forest,Pinus forest and scrub forest was 890, 1070 and 170 trees ha−1, respectively. Total basal cover of trees (m2 ha−1) was: 54·59, mixed forest; 42·05,Pinus forest; 8·20, scrub forest. The density of shrub varied from 8250–11050 plants ha−1.
pp 127-130 April 1989
Meiosis in the hybrids betweenUrena lobata ssp.lobata andUrena lobata ssp.sinuata was normal with 14 bivalents thereby indicating close homology of the two genomes. The inheritance of leaf lobing was studied in F1, F2 and F3 generations. It is seen that leaf lobing inUrena lobata is a monogenic trait with incomplete dominance. Evidence from this study supports the retention of the subspecies status of the taxa.
pp 131-134 April 1989
The paper deals with the cytology of 10 taxa of 8 species of the genusPteris L. from Kumaon in northwest Himalaya.Pteris biaurita andPteris dactylina are apogamous triploids (n=87),Pteris excelsa andPteris quadriaurita are sexual diploids (n=29), whereasPteris vittata is a sexual tetraploid (n=58) andPteris stenophylla is an apogamous diploid (n=58).Pteris cretica is represented by diploid (n=58) and triploid (n=87) apogamous races.Pteris wallichiana is normally sexual diploid (n=29) but an apogamous diploid (n=58) form from this area is a new record. Sexual mode of reproduction is observed in 40% taxa whereas 60% are apogamous.
pp 135-137 April 1989
Tissue cultures of 7 cultivars of sesame (Sesamum indicum L.) were established using seedling explants. Multiple shoot buds were observed in shoot tip cultures in all the cultivars with different frequencies. Shoot tips excised from seeds pretreated with cytokinin increased the frequency of induction of multiple shoot buds. Rooted plantlets from isolated shoot buds were successfully established in soil. The plants have matured and flowered.
pp 139-145 April 1989
Amendment of soil with 15 mM Ca(NO3)2 deferred senescence of intact primary leaves of cowpea in terms of chlorophyll retention and protein breakdown. The basic biochemical changes like the lipid composition, lipid peroxidation and the activity of superoxide dismutase were studied. Analyses of glycolipids and phospholipids indicated linear degradation parallel to leaf age with a concomitant decrease in the activity of superoxide dismutase and increase in the level of lipid peroxidation. These changes appear to have been modulated by Ca2+ ion in the postponement of senescence.
pp 147-153 April 1989
Plants of spreading type of groundnut (Arachis hypogaea cv. M-13) were given foliar sprays separately with phenolic compound β-naphthol-1-amino, 4-sulphonate (50, 100, 150 μg/ml) and a mixture of aliphatic alcohols—C-24 to C-34 (1 μg/ml) at 30 and 37 days after flowering. In the treated plants, the total number of flowers produced per plant, number of flowers in the initial 3 weeks increased significantly. Both the compounds required lesser number of days for the production of initial 70 flowers as compared with control. With aliphatic alcohols several of the kernel and pod characters increased significantly over the control. Flowering in phase A showed a positive significant correlation with some of the yield characters though it was significantly negatively correlated with harvest index. The compounds were effective in inducing the establishment of early potential sinks and caused efficient mobilization of assimilates for a longer filling period in the pods.
pp 155-163 April 1989
The present paper deals with quantitative estimations of DNA, RNA, total and-SH proteins during different stages of pollen development inNajas marina L. Attempts were also made to study insoluble polysaccharides qualitatively. The changes in the macromolecular substances were investigated and correlated with cell divisions, growth and differentiation during microsporogenesis and pollen development.