Natural outcrossing and isolation distance requirements in exserted stigma tomato (Solanum lycopersicum) seed production

K PADMINI; A T SADASHIVA; L B NAIK

doi:10.56093/ijas.v84i12.45211

Authors

K PADMINI Indian Institute of Horticultural Research, Bangalore, Karnataka 560 089
A T SADASHIVA Indian Institute of Horticultural Research, Bangalore, Karnataka 560 089
L B NAIK Indian Institute of Horticultural Research, Bangalore, Karnataka 560 089

https://doi.org/10.56093/ijas.v84i12.45211

Keywords:

Exserted stigma, Genetic purity, Hybrid seed production, Tomato

Abstract

Genetic purity is of utmost important in seed production of varieties and hybrids. Since exserted stigma tomato types are much prone to natural crossing the chances of genetic contamination is higher in seed production and the recommended isolation requirements for hybrid seed production is higher (200m for foundation seeds and 100m for certified seeds). Hence, studies were conducted at Indian Institute of Horticultural Research, Bangalore, during rabi season of three years, 2007 to 2010 with an objective of determining the extent of natural cross pollination in terms of genetic contamination and to optimize the minimum isolation distance requirements for maintaining genetic purity in seed production of exserted stigma (recessive) tomato. The natural out crossing, i.e. genetic contamination was within 2% (permissible genetic standards) at a minimum isolation of 50m in interior rows of seed plots (R2 and R3) and in all the three years of study. Hence, a safer minimum isolation of 50 m with border rows is sufficient for tomato seed production using exserted stigma Ex-3 as seed parent for obtaining seeds of permissible genetic purity standards (98 %) under IIHR, Bangalore conditions, which is lesser than the recommended isolation of 200m for foundation seeds and 100m for certified seeds in hybrid seed production of tomato.

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References

Atanassova B. 1999. Functional male sterility (ps-2) in tomato (Lycopersicon esculentum Mill.) and its application. Euphytica 107: 13–21. DOI: https://doi.org/10.1023/A:1003527714805

Gladis T Hammer G K, Dathe H H and Pellmann H 1996. Insect pollination and isolation requirements in tomato collections (Lycopersicon esculentum Mill). Plant Genetic Resources Newsletter 106: 16–9.

Groenewegen C, King G and George B F. 1994. Natural cross pollination in California commercial tomato fields. Hort Science 29: 1 088. DOI: https://doi.org/10.21273/HORTSCI.29.9.1088

Haskell G and Paterson E B. 1966. Genetic determination of natural self pollination in Scottish glasshouse tomatoes. Euphytica 15: 128–32. DOI: https://doi.org/10.1007/BF00024088

Kilcheilchevsky A and Dodrodkin M. 2000. Use of functional male sterility in seed production of tomato hybrids. Acta physiologiae –plantarum 22(3): 232–4. DOI: https://doi.org/10.1007/s11738-000-0018-1

Liu LW, Hou X L, Gong Y Q, Zhang Y M, Wang K R and Zheng J F. 2004. Natural cross pollination in tomato. Molecular Plant Breeding. 2: 563–8.

National Horticulture Board. 2010. Indian Horticulture Database. www.nhb.gov.in/.

Quiros C F and Marcias A.1978. Natural cross pollination and pollinator bees of the tomato in Celaya, Central Mexico. Hort Science 13 (3): 290–1. DOI: https://doi.org/10.21273/HORTSCI.13.3.290

Reeves A F I I. 1973. An observation on natural outcrossing in the tomato Lycopersicon esculentum L. in northwest Arkansas. Proceedings of the Arkansas Academy of Science 27: 24–5.

Singh R Singh D and Kanwar J S. 2012. Studies on the extent of genetic contamination in seed production of exserted stigma tomato (Solanum lycopersicon L). Hort Flora Research Spectrum 1(4): 306–11.

Tunwar N S and Singh SV. 1998. Indian minimum seed certification standards. Central Seed Certification Board. Government of India, New Delhi.