Cytogenetical studies on autotriploid (2n×4n) olitorius jute ( Corchorus olitorius Linn. strain chinsurah green)
01 Jan 1965-Vol. 34, Iss: 8, pp 335-340
TL;DR: Height, base diameter, the number of branches,the number of pods, the size of ultimate fibres, leaf measurements, pod measurements, measurements of guard cells, number of full seeds per pod in case of autotriploid jute were noted and compared with diploid and autotetraploids jute.
Abstract: 1.
Height, base diameter, the number of branches, the number of pods, size of ultimate fibres, leaf measurements, pod measurements, measurements of guard cells, number of full seeds per pod in case of autotriploid jute were noted and compared with diploid and autotetraploid jute.
2.
Mean numbers of chromosome associations per p.m.c in 3 n jute show 2.48 univalents, 4.64 bivalents, 0.58 trivalents, 1.80 quadrivalents, 0.064 hexavalents and 0.064 fragments. Quadrivalents are noticed in the forms of ring and chain. Y-shaped trivalent is common. Chromosome numbers varied.
3.
Laggards, occasional bridges due to stickiness, irregular segregation, late dividing bivalents etc. are noted. Elimination of chromatin bodies is observed.
4.
Monads to octads with or without micronuclei are recorded.
5.
Fertility percentage in 3 n (63.5%) is compared with 2 n and 4 n. Pollen diameters of 3 n is also compared with those of 2 n and 4 n.
References
More filters
TL;DR: Tetraploidy was induced in a vegetable and a fodder type of cluster bean by treating presoaked seeds as well as apical buds with colchicine solution and a triploid plant was obtained in Pun.
Abstract: 1. Tetraploidy was induced in a vegetable and a fodder type of cluster bean by treating presoaked seeds as well as apical buds with colchicine solution.2. In the tetraploids, the height was significantly increased during the later stages; the stem was thicker, and the number of branches was similar to the diploids in Pun. 3 and increased in the unbranched Sadabahar.3. Tetraploidy has brought a variety of changes in the foliar characters such as size, thickness, surface, margin, colour, etc.4. Flowering was delayed in tetraploids during monsoon season but not in summer crop. The flowers were larger and more number of them opened per inflorescence prolonging the blooming period. Pollen fertility was low and the stainable grains were variable in size.5. Fruit setting was reduced in Pun. 3, but increased significantly in Sadabahar. Pods were, however, smaller but seeds larger.6. Quadrivalents occur frequently at synapsis and anaphase separation was irregular.7. Aneuploids having 29 chromosomes were detected in the progeny of Sadabahar tetraploids which were less fertile and differed in some respects from tetraploids.8. A triploid plant was obtained in Pun. 3 which had luxuriant vegetative growth but was totally sterile. Trivalents predominated among the different meiotic configurations.
5 citations