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Floral Biology and Fruit Setting Studies in Chile.

Floral Biology and Fruit Setting Studies in Chile. Ashish Saxena and Jarnail S Hundal. PAU, Ludhiana. 33 o. NMSU, Las Cruces. Punjab Agricultural University, Ludhiana (www.pau.edu) Punjab state. Punjab Agricultural University, Ludhiana (www.pau.edu) Punjab state.

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Floral Biology and Fruit Setting Studies in Chile.

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  1. Floral Biology and Fruit Setting Studies in Chile. Ashish Saxena and Jarnail S Hundal

  2. PAU, Ludhiana 33o NMSU, Las Cruces

  3. Punjab Agricultural University, Ludhiana (www.pau.edu) Punjab state

  4. Punjab Agricultural University, Ludhiana (www.pau.edu) Punjab state

  5. Capsicum annuum L. in Punjab • Important cash crop • fresh market • processing industry. • Higher net returns • diversification from • paddy (Oryza sativa L.) • wheat (Triticum aestivum L.) • Excellent performers (hybrids) • CH 1 • CH 3

  6. Existing problem • Required quantity of hybrid seed was not available. • Available seed quality was poor due to low germination per cent. • Hybrid seed production is problematic.

  7. Floral Biology • Study of life of flowers which includes initiation and anthesis of flowers, dehiscence of stamens, receptivity of stigma and development of fertilized ovary. • Thorough knowledge is a pre requisite for embarking upon a crop breeding and hybridization program. • Floral-biology of chile changes across different locations.

  8. Seasonal variation • Environment plays a pivotal role in fruit and seed formation. • Temperature and relative humidity (RH) are the major contributing factors. • Effects of climatic factors on floral biology, seed yield and seed quality are not well known.

  9. So…

  10. Objectives • Optimize F1 seed production through other restorer lines • Determine impact of environment on seed production.

  11. How ??? Determine: • Pollen viability of male parents. • Fruit set of restorer lines when crossed with GMS (Genetic Male Sterile) line. • Seed germination of F1 seeds • Monthly during peak flowering season (June to September).

  12. Materials & Methods

  13. Genotypes Female Restorer Lines I 16 LLS Pepsi 8-1 PS 4221 Punjab Guchhedar S 2529 S 2530 S 2545 MS 12 X (Genetic Male Sterile) (1:1 male : female)

  14. Identification of female in GMS

  15. Identification of female in GMS Uprooted before hand pollination

  16. Identification of female in GMS Used for hand pollination as female

  17. Pollen load Collection of freshly opened flowers Dehisced pollen dissolved in 1 μ L of dH2O with vertexer Pollens counted on hemocytometer

  18. Pollen viability Collection of freshly open flowers Dehisce anthers at room temperature Preparation of glass slides with pollen and fresh TTC* Slides placed in dark for half an hour Observed under compound microscope for red staining * (2,3,5 triphenyl tetrazolium chloride) Viable pollen

  19. Fruit set Identification of female plants in GMS line Hand pollination of 50 buds at 4 different periods by all 8 restorer lines separately Counting of fruits set after 5 days of crossing Four different periods are: [-12, 0, +12 and +24 h after anthesis]

  20. Seed germination Collection of crossed seeds from female plants 25 seeds in 3 replications of each cross were placed on moist germination paper Placed in incubator at 25±10 C for 14 days Counting of germinated seeds

  21. Statistical Analysis Randomized complete block design was used to analyze the data obtained from experiment. The data were pooled over different months to obtain useful results. CPCS 1 computer program was used for statistical analysis.

  22. Observations

  23. Restorer lines

  24. - Time

  25. a b b b c c d e Restorer lines LSD0.05 = 2.0

  26. a b b c c d c d e f d e Restorer lines LSD0.05 = 3.9

  27. a b b c c d d e e e f Restorer lines LSD0.05 = 4.6

  28. Results I • Maximum fruit set was observed when crossing was done at the time of anthesis. • S 2529 had highest pollen load and pollen viability, but lower fruit set prevent this restorer line to consider. • Punjab Guchhedar was the best restorer line for fruit set with highest germination of F1 seeds, despite lower pollen viability. • Significant genotype and environment interaction was observed.

  29. Results II • Environment seems to play negligible role in determining the pollen viability. • Fruit set and seed germination ability greatly influenced by the temperature and relative humidity. • Average monthly temperature of 30oC and 82% RH gave highest fruit set. • Highest seed germination was observed at 29oC and 70% RH.

  30. Conclusion • Punjab Guchhedar was the only restorer line performed consistently across different temperature and RH regimes from June to September months. • June and July months were found to be better for seed production of CH 1 hybrid. • August and September months were found to be better for seed production of CH 3 hybrid.

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