Good illustrative information after keen observation. Was not aware of that.
On 5 January 2011 02:41, Pankaj Kumar <sahanipan...@gmail.com> wrote: > If you notice properly in the first pic of Dinesh sir, you can see > that in one flower all anthers are pointed upwards where as in other > two the anthers are pointed downwards and backwards. > > There are phenomena in plants called HERKOGAMY [Herkogamy is a common > strategy employed by hermaphroditic angiosperms to reduce sexual > interference between male (anthers) and female (stigma) function. ] > and DICHOGAMY [Dichogamy, also known as sequential hermaphrodism, is > the separation in time of gender expression in a hermaphroditic > organism. In the context of the plant sexuality of flowering plants > (angiosperms), there are two forms of dichogamy: protogyny—female > function precedes male function—and protandry—male function precedes > female function.] . > > Zizyphus had protoandrous flowers, i.e., androecium develops to > maturity first and after sometime gynoecium attains maturity, in > simple words, there is a distinct delineation of male and female phase > in the same flower as both anther and stigma dont mature at one time > hence inhibiting self pollination. > > In the flower above, the anthers mature first (during erect position > as in the picture, which has white pollens on the anthers] but stigma > remains immature, hence the insect will come collect pollens from the > erect anthers but pollens wont be able to get deposited on the stigma > of the same plant because the stigma will not be mature enough to let > the pollen stick to it. Hence if and when the insect will visit > another flower which has mature stigma, pollen gets deposited. In > other words, pollen from one flower is avoided from getting deposited > on the stigma of the same flower. > > There are some other terms here which are useful: > Geitonogamy: In this pollination of a flower with the pollen from > another flower on the same flowering plant. > Xenogamy: In this pollination of a flower takes place by pollens from > a different plant . > > Read following links for more knowledge: > http://en.wikipedia.org/wiki/Herkogamy > http://en.wikipedia.org/wiki/Dichogamy > > Hope I am understandable. > Pankaj > > On Wed, Jan 5, 2011 at 12:47 AM, Dinesh Valke <dinesh.va...@gmail.com> > wrote: > > NATIVE, WILD, CULTIVATED :: Rhamnaceae (buckthorn family) » Zizyphus > > mauritiana ... also spelt: Zizyphus > > > > > > ZIZ-ih-fuss -- an ancient Greek name derived from the Persian word > zizafun > > maw-rih-tee-AY-nuh -- of or from Mauritiana, a north African area > > > > > > commonly known as: Chinese apple, Chinese date, cottony jujube, Indian > > jujube, Indian plum, sour jujube, Yunnan jujube, Yunnan spiny jujube • > > Hindi: बदर badar, बेर ber, कुबल kubal, फेनिल phenil, पिच्छल picchal • > > Kashmiri: bari, konkamber, phitni • Konkani: बॉर्र boaarr • Manipuri: > boroi > > • Marathi: बोर bor, सौबरी saubari • Punjabi: amlai, barari, simli, singli > • > > Sanskrit: बदर badar, बद्री badri, सौवीर sauvir • Tamil: எளந்தை elandhai • > > Telugu: రేగు regu > > > > > > Native to: south Asia (mainly India) > > > > > > > > > > -- > *********************************************** > "TAXONOMISTS GETTING EXTINCT AND SPECIES DATA DEFICIENT !!" > > > Pankaj Kumar Ph.D. (Orchidaceae) > Research Associate > Greater Kailash Sacred Landscape Project > Department of Habitat Ecology > Wildlife Institute of India > Post Box # 18 > Dehradun - 248001, India >
