Journal of Horticultural Sciences

M. Pitchaimuthu ¹, O. P. Dutta ¹, K. R. M. Swamy ¹

Affiliations
1 Indian Institute of Horticultural Research, Bangalore, Karnataka - 560 089, IN

Abstract

Inheritance of geneic male sterility in GMS line MS-1 of okra [Abelmoschus esculentus (L.) Moench.] was studied using F₁, F₂ and test-cross generations of crosses between GMS line MS-1 and normal fertile genotypes, and the varieties Arka Anamika, Parbhani Kranti, Arka Abhay, IIHR-108-1-31, IIHR-109-20-6, IIHR-116-23-6, IIHR- 180-6-3, IIHR-161-10-1 and IIHR-130-2-10. All the F₁ were found fertile. Segregation of pollen fertility in F₂ and test - cross generations involving ms1 was segregated in the ratio 1 fertile: 1 sterile, respectively. This indicated that GMS trait in the line is controlled by a single recessive gene (ms1ms1). Large-scale F₁ hybrid seed production in okra becomes rather slow due to the tedious hand-emasculation, followed by hand-pollination, incurring additional labour and cost of F₁ seed production. In comparison to fertile lines, this saves approximately 70% time and manual labour. Use of Geneic Male Sterile (GMS) line MS-1 can make F₁ hybrid seed production in okra easy and more economical compared to hand-emasculation.

Keywords

Abelmoschus esculentus, Geneic Male Sterility (GMS), Back Cross, Generations, Recessive Allele.

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M. Pitchaimuthu ¹, O. P. Dutta ¹, V. S. R. K. Krishna Prasad ², K. R. M. Swamy ¹

Affiliations
1 Division of Vegetable Crops, Indian Institute of Horticultural Research, Hessaraghatta Lake Post, Banaglore-560 089, IN
2 National Research Centre for Onion and Garlic, Rajgurunagar, Pune, IN

Abstract

Transgressive segregation in the population of IIHR-31-1-2 x Arka Anamika BC3 F1-F6 generations led to the development of, various novel characters such as, ridgeless fruits (round fruit) and enhanced nodal productivity bearing short internodal length in okra selection-1, which was found to be promising for cultivation with high yield and good fruit quality. It can be grown both during Kharif and summer seasons. Okra selection-1 was also found to exhibit smooth fruits, high yield potential with sturdy plant habit and field tolerance to fusarium wilt and YVMV. Due to rapid rate of increase of processing in okra by freezing and canning, Okra selection I may be an ideal fruit type for freezing because of its short, smooth, dark green and round or multifaceted fruits with low mucilage content.

Keywords

Novel Character, Ridgeless, Introgression, Processing.

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