doi:

DOI: 10.3724/SP.J.1002.2008.00053

Journal of Systematics and Evolution 2008/46:1 PP.53-61

Floral organogenesis of three species of Jatropha (Euphorbiaceae)


Abstract:
Floral organogenesis of three species of the genus Jatropha L. of the family Euphorbiaceae, viz., J. curcas L., J. podagrica Hook. and J. gossypifolia L., was studied with scanning electron microscope (SEM). The first sepal primordium is initiated in non-median abaxial position and the second one in median adaxial position. Five sepal primordia arise in a 2/5 sequence on the periphery of the floral apex and are initiated anticlockwise or clockwise in different floral buds of the same species. Five petal primordia initiate simultaneously. There are dicyclic stamens in male flowers with the outer whorl of stamens opposite to the petals (obdiplostemony) and inner whorl opposite to the sepals. Two types of stamen development exist in the genus. In J. curcas, belonging to subgen. Curcas, five stamen primordia of the outer whorl arise simultaneously at first and then five of the inner whorl initiate simultaneously. In J. podagrica and J. gossypifolia, belonging to subgen. Jatropha, eight to nine stamen primordia of the two whorls arise simultaneously. In the female flowers, three carpel primordia appear simultaneously. The flowers of these three species are unisexual. In the female flowers, the ovary bulges and the stamens degenerate, whereas in the male flowers, the stamens grow normally but the ovary is absent. The division of the genus with subgenera is supported by the stamen development.

Key words:Euphorbiaceae, Jatropha, organogenesis, systematic implication.

ReleaseDate:2014-07-21 14:10:09



APG (the Angiosperm Phylogeny Group). 2003. An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II. Botanical Journal of the Linnean Society 141: 399–436.

Chang Y-T (张永田). 1996. Jatropha Linn. In: Flora Reipublicae Popularis Sinicae (中国植物志). Beijing: Science Press. 44 (2): 147–149.

Chase MW, Zmartzty S, Lledó MD, Wurdack KJ, Swensen SM, Fay MF. 2002. When in doubt, put it in Flacourtiaceae: a molecular phylogenetic analysis based on plastid rbcL DNA sequences. Kew Bulletin 57: 141–181.

Chen J (陈机). 1996. Plant development anatomy (植物发育解剖学). Jinan: Shandong University Press. 3: 14–36.

Dehgan B, Webster GL. 1979. Morphology and infrageneric relationships of the genus Jatropha (Euphorbiaceae). University of California Publications in Botany 74: 1–73.

Endress PK. 1994. Diversity and evolutionary biology of tropical flowers. Cambridge: Cambridge University Press.

Endress PK, Stumpf S. 1991. The diversity of stamen structures in “Lower” Rosidae (Rosales, Fabales, Proteales, Sapindales). Botanical Journal of the Linnean Society 107: 217–293.

Hemming CF, Radcliffe-Smith A. 1987. A revision of the Somali species of Jatropha (Euphorbiaceae). Kew Bulletin 42: 105–127.

Judd WS, Campbell CS, Kellogg EA, Stevens PF, Donoghue MJ. 2002. Plant systematics: a phyllogenetic approach. 2nd ed. Sunderland: Sinauer Assosiates, Inc.

Kathriarachchi H, Hoffmann P, Samuel R, Wurdack KJ, Chase MW. 2s (plastid atpB, matK, 3' ndhF, rbcL, and nuclear PHYC). 005. Molecular phylogenetics of Phyllanthaceae inferred from five gene. Molecular Phylogenetics and Evolution 36: 112–134.

Li P-T (李秉滔). 1994. Euphorbiaceae. In: Flora Reipublicae Popularis Sinicae (中国植物志). Beijing: Sciences Press. 44 (1): 1–217.

Lin J (林娟), Zhou X-W (周选围), Tang K-X (唐克轩), Chen F (陈放). 2004. A Survey of the studies on the resources of Jatropha curcas. Journal of Tropical and Subtropical Botany (热带亚热带植物学报) 12: 285–290.

Mabberley DJ. 1997. The plant-book: a portable dictionary of the vascular plants. Cambridge: Cambridge University Press.

Radcliffe-Smith A, Esser H J. 2001. Genera Euphorbiacearum. Kew: Royal Botanic Garden.

Savolainen V, Fay MF, Albach DC, Backlund A, van der Bank M, Cameron KM, Johnson SA, Lledó MD, Pintaud JC, Powell M, Sheahan MC, Soltis DE, Soltis PS, Weston P, Whitten WM, Wurdack KJ, Chase MW. 2000. Phylogeny of the eudicots: a nearly complete familial analysis based on rbcL gene sequences. Kew Bulletin 55: 257–309.

Singh V. 2005. Organogenesis of the flower of Jatropha gossypifolia L. with particular reference to obdiplostemony. Proceedings of the Indian National Science Academy 75 (B), II: 126–130.

Soltis DE, Soltis PS, Chase MW, Mort ME, Albach DC, Zanis M, Savolainen V, Hahn WH, Hoot SB, Fay MF, Axtell M, Swensen SM, Prince LM, Kress WJ, Nixon KC, Farris JS. 2000. Angiosperm phylogeny inferred from 18S rDNA, rbcL and atpB sequences. Botanical Journal of the Linnean Society 133: 381–461.

Sun K (孙坤), Chen J-K (陈家宽), Chen Z-D (陈之端). 1998. Progress in studies on floral development of angiosperms and some consideration on future studies. Acta Phyto- taxonomica Sinica (植物分类学报) 36: 558–568.

Takhtajan A. 1991. Evolutionary trends in flowering plants. New York: Columbia University Press.

Webster G L. 1994. Synopsis of the genera and suprageneric taxa of Euphorbiaceae. Annals of the Missouri Botanical Garden 81: 33–144.

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