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|Title: ||Karyomorphology of natural banana hybrids|
|Authors: ||A., Rekha|
S C, Hiremath
|Issue Date: ||2007|
|Citation: ||Rekha .A and S.C.Hiremath 2007. Karyomorphology of natural banana hybrids. National Conference on Production and utilization of banana for livelihood and nutritional security. Oct 25-28. NRCB, Trichy|
|Abstract: ||Banana cultivars have evolved from two main species M acuminata and Mbalbisiana,
which belongs to the section Eumusa. It is necessary to understand its relationships and the homology in its natural hybrids. The existing natural hybrids are AB genomic group cultivars, which are of south Indian origin. The fruits are known for its special ~aste and quality. They are said to be male and female sterile. The other important groups are AAB with four subgroups viz.,
Plantain a important group with dual purpose fruits which also used in processing industry, Silk group with Rasthali as preferred cultivar, Pome group consisting of Hill banana and Mysore subgroup having high yields also known as fill basket. Another important set of cultivated
bananas belong to ABB genomic group consisting of cooking bananas.
Cytological studies were made by fixing the actively growing root apices from healthy
suckers planted in pots. The root tips were pre-treated with 8-Hydroxyquinoline and fixed in Carnoy's-II fixative. The stored root tips were stained with Schiff's reagent and squashed. The selected metaphase plates were used for karyomophological studies.
Three cultivars of diploid AB group, Eleven cultivars of AAB group VIZ., 5 from
subgroup Pome, one cultivar of Mysore subgroup, three cultivars of subgroup Silk and two cultivars of Plantain subgroup were included in the study. Seven cultivars of ABB group were studied for their karyomorphological status. The studies confirmed the ploidy status of most of the cultivars. There were variations in the karyotypes, in terms of absolute length of the chromosomes. However the A and B chromosomes could not be differentiated based on their morphological appearance. It has helped in solving some the confusions like, the cultivar Klue
tiparad was earlier classified as natural tetraploid (ABBB) by Simmonds based on the plant morphological characteristics but was found to be a triploid cultivar. The latest studies on its chromosome number and DNA content revealed the triploid nature of the cultivar. Hence it was grouped under ABB group by Jenny et.al,. (1997). The present study also confirms the triploid
nature of the cultivar Klue tiparad. The cultivar Kunnan a collection from Kerala, which was placed in AB group, was found to be triploid in nature with 2n=33 chromosomes.|
|Appears in Collections:||Fruit Crops|
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