The International Journal of Plant Reproductive Biology
(Indexed by CABI)
ISSN Print : 0975-4296; ISSN Online : 2249-7390

 
Volume-6, Number-2, July, 2014
 

Pollination system in two widely occurring vetches- Vicia hirsuta (L.) Gray and V. sativa L.

Uzma Hamal* & Namrata Sharma
Department of Botany, University of Jammu, Jammu-180 006, J&K, India.

*e-mail:
uzmahamal@gmail.com
Received: 07. 11.2013; Revised: 23.01.2014; Accepted & Published on line: 01.02.2014
  ABSTRACT
Two species of the genus Vicia L., namely V. hirsuta (L.) Gray and V. sativa L., forming allopatric as well as sympatric populations in North-west Himalaya, have been investigated. Plants of both the species reproduce only sexually and are prolific flower producers. They complete their life-cycle in a short span of 3-3.5 months. Although flowers in both the species are papilionaceous, V. hirsuta has small, dull white flowers while V. sativa has comparatively large and bright pink flowers. Flowering phenology of the two species reveals V. hirsuta to be slightly protogynous and V. sativa to be protandrous. However, lack of insect visits disables V. hirsuta to harvest the benefits of dichogamy. On the other hand, V. sativa enjoys the benefits of both self- and cross-pollination. A common feature favouring selfing in the species is the occurrence of in-situ pollen germination. The present paper discusses multiple pollination pathways that these two annuals adopt in order to ensure reproductive efficiency in their short life span.
Keywords : Herbivory, in-situ pollen germination, papilionaceous corolla, patchy distribution, protandry, protogyny, stylar  
                  brush
Volume : 6(2) pp. 111 - 121, 2014 Download PDF
 
 

Reproductive biology of Panax wangianus (Araliaceae): a critically endangered medicinal plant

N. Venugopal* & Preeti Ahuja
Plant Anatomy and Reproductive Biology Laboratory, Department of Botany,
North-Eastern Hill University, Shillong-793022, Meghalaya, India

*e-mail:
nvenugopal3@gmail.com
Received: 20.11.2013; Revised: 06.03.2014; Accepted & Published on line: 07.06.2014
  ABSTRACT

Panax wangianus (Syn. Panax pseudoginseng) S. C. Sun (Araliaceae) is a critically endangered, medicinal plant of north-east India. Present investigation was undertaken to obtain information on the phenology, pollination and breeding behavior of Panax wangianus S. C. Sun growing in Nongkrem sacred forest. This will be useful in developing recommendations for the conservation of this intensively collected medicinal herb. Number of pollen grains/ flower, pollen: ovule ratio, pollen germination, pollen tube growth, stigma receptivity, pollinators, breeding system and fruit/seed dispersal mechanism in P. wangianus have been investigated. Flowers are small, hermaphrodite, odor-less with one to five styles. The total number of pollen grains in one flower of P. wangianus ranges from 2000 to 2500, out of which 43 percent pollen grains are viable and 57 percent are nonviable. The large cluster of pollen grains with viscin threads in P. wangianus is the first report in thefamily Araliaceae. Pollen grains are tricellular, tricolpate with reticulate sculpturing. P. wangianus exhibited reverse herkogamy which enhances the chances of cross-pollination by the bees and flies belonging to family Halictidae and Syrphidae respectively.

Keywords : Breeding behavior, Panax wangianus S. C. Sun, pollination mechanism.

Volume : 6(2) pp. 122 - 128, 2014 Download PDF

 
 

Morphological and histochemical studies on trichomes on different parts of Boerhavia diffusa L.

*Gulshan Chaudhary & Prem Kumar Dantu**
Department of Botany, Dayalbagh Educational Institute (Deemed University),
Dayalbagh, Agra 282110, Uttar Pradesh, India

e-mail:
*deigulshan.chaudhary0@gmail.com,
**premdantu@gmail.com}
Received: 29.06.2013; Revised: 3