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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2017: 100.00
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2017: 100.00
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
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Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2017: 100.00
NAAS RATING 2018: 5.38

Int.J.Curr.Microbiol.App.Sci.2019.8(10): 1400-1409
DOI: https://doi.org/10.20546/ijcmas.2019.810.164


Evening Primrose (Oenothera biennis L.): Morphology and Reproductive Biology
Usha Thakur1*, Bhupender Dutt1, S. S. Sharma1, Kulwant Rai Sharma1 and Nisha Thakur2
1Department of Forest Products, College of Forestry, Dr. Y. S. Parmar University of Horticulture and Forestry, Nauni-Solan, Himachal Pradesh, India, 173230
2ICAR-IARI, Regional Station, Katrain, Himachal Pradesh, 175129, India
*Corresponding author
Abstract:

Oenothera biennis L., commonly known as Evening Primrose as flowers open in the evening. Inflorescence is racemose (spike) and flowering continues for about 3 months. Circular floral nectary of translucent colour are present at the point of attachment of petals and hypanthium. Pollen are triporate, of variable sizes held together by viscin threads. Sepals colour change from green to yellowish green, act as indicator of anther dehiscene in the morning in closed conditions and anthesis in the evening. Flower is protandrous. The stigmatic lobes remain compact above the anthers till anthesis. Stigma radiates and turns receptive at the time of anthesis on the same day in the evening and remains so till next day afternoon. Anthesis completes with in 15 minutes i.e. from closed bud to full bloom. The species is both self and cross pollinated but mostly cross pollinated and is carried out by insects during both day and night. It is both cross as well as self-compatible.


Keywords: Evening primrose, Oenothera biennis L., Pollination, Self and Cross pollination
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How to cite this article:

Usha Thakur, Bhupender Dutt, S. S. Sharma, Kulwant Rai Sharma and Nisha Thakur. 2019. Evening Primrose (Oenothera biennis L.): Morphology and Reproductive Biology.Int.J.Curr.Microbiol.App.Sci. 8(10): 1400-1409. doi: https://doi.org/10.20546/ijcmas.2019.810.164