Abstract:
Panax notogins eng is a precious traditional Chinese medicine, it faces the challenges of
low reproduction rate and extinction of wild resources. In order to explore the characteristics of
the flowering biology and breeding system, and to clarif y the reasons for the low fruiting rate of P.
notoginseng in the natural state. The paper investigated its flowering biological parameters,
pollination system and artificial pollination. The results were as follows: (1) The single flower,
single plant, and flowering period of the population, were approximately 4 5 d, 20 25 d and 60 d,
respectively. (2) P. notogins eng had the floral characteristics of herkogamy and dichogamy , which is the type of
protandrous plant. (3) The pollen grains were medium size and had three
germinations holes. (4) P. notogins eng had the highest pollen viability on the first day of flowering,
and the stigma got receptivity on the 12th day. (5) The hybridization index ( o ut crossing index ,
OCI ) was 4, the breeding system of P. notogins eng was mainly outcrossing with partial
self compatible, which required pollinatorand the pollen/ovule ratio ranged from 450 .0 to 1 037.5 ,
the breeding system was obligate xenogamy. (6) Pollination test showed that the breeding system
was a mixed mating s ystem with both self and xenogamy, pollination is assisted by both insect and
wind vectors. (7) The main flower visiting insects are the Apis cerana , the Episyrphus balteatus
and the Riptortus pedestris .The Apis cerana was dominant flower visiting insect. Based on the
above, the breeding system of Panax notogins eng belonged to the facultative heterozygous type,
partially self compatible, and insect mediated pollination was critical. Needing wind and insect
pollinators. Pollen limitation and high disease sev erity at flowering and fruiting stage are the key
factors affecting its fruitfulness. These results can provide theoretical basis for the cultivation and
improving seed breeding of Panax notoginseng
Hits1366
Downloads464
Related Information