Results 161 to 170 of about 1,897 (183)

ORGAN INITIATION AND THE DEVELOPMENT OF UNISEXUAL FLOWERS IN THE TASSEL AND EAR OF ZEA MAYS

American Journal of Botany, 1983
The development of the unisexual male and female flowers of Zea mays from bisexual initials in both tassels and ears has been reinvestigated with SEM and TEM. The early stages of spikelet branch primordia, spikelet initiation, and early flower development are similar in both flowers, though differences in rates of growth of glumes, lemmas, and palea ...
R I Greyson, D B Walden
exaly   +4 more sources

TRANSITION FROM HERMAPHRODITIC TO UNISEXUAL FLOWERS IN MALE AND FEMALE PLANTS OF ASPARAGUS.

Acta Horticulturae, 1996
Sex determination and differentiation have been studied by different approaches: morphological, biochemical and genetic. Flower development has been followed by SEM and divided in different stages. Major biochemical events (protein pattern, RNase activities and levels of hormones possibily involved in sex differentiation) were analysed at these stages.
Marziani Longo, G. P., Caporali, E., Carboni, A., Spada, A., Falavigna, A.   +4 more
openaire   +1 more source

Unisexual flowers from the Deccan Intertrappean Bed of Madhya Pradesh, India

Journal of Palaeosciences, 2003
Unisexual flowers are described for the first time from the Deccan Intertrappean Bed of MohgaonKalan, Chhindwara District, Madhya Pradesh, India. The female flower viz., Flosfemina intertrappea is sessile with perianth and unilocular, superior ovary with many ovules.
R.K. Kar, K. Ambwani, A. Sahni, P. Sharma   +3 more
openaire   +1 more source

Flower Size Dimorphism in Plants with Unisexual Flowers

1996
Angiosperm species exhibit variation in every aspect of their flowers, from obvious differences in color, size, shape, and number to less conspicuous differences such as nectar production and the schedule of events that take place within each flower. Sprengel (1793) was perhaps the first to realize that floral characters are shaped by their function ...
openaire   +1 more source

Flower Structure and Development ofSpondias tuberosaandTapirira guianensis(Spondioideae): Implications for the Evolution of the Unisexual Flowers and Pseudomonomery in Anacardiaceae

International Journal of Plant Sciences, 2021
Premise of research. Anacardiaceae comprise two subfamilies (Anacardioideae and Spondioideae) with small nectariferous flowers that are typically morphologically bisexual, whereas sometimes only th...
Elisabeth Dantas Tölke, Diego Demarco, Sandra Maria Carmello-Guerreiro, Julien B. Bachelier   +3 more
openaire   +1 more source

Unisexual flower, spikelet, and inflorescence development in monoecious/dioecious Bouteloua dimorpha (Poaceae, Chloridoideae)

American Journal of Botany, 2008
Unisexual flowers have evolved repeatedly in the angiosperms. In Poaceae, multiple transitions from bisexual to unisexual flowers are hypothesized. There appear to be at least three distinct developmental mechanisms for unisexual flower formation as found in members of three subfamilies (Ehrhartoideae, Panicoideae, Pharoideae). In this study, unisexual
Michael S, Kinney, J Travis, Columbus, Elizabeth A, Friar   +2 more
openaire   +2 more sources

Protandry, synchronized flowering and sequential phenotypic unisexuality in neotropical Pentagonia macrophylla (Rubiaceae)

Oecologia, 1986
The neotropical shrub Pentagonia macrophylla Benth. (Rubiaceae) has protandrous two-day flowers. Synchronous development among flowers on a single individual results in sequential phenotypic unisexuality: the entire plant alternates gender from day to day.
openaire   +2 more sources

Evolution of unisexual flowers in grasses (Poaceae) and the putative sex‐determination gene, TASSELSEED2 (TS2)

New Phytologist, 2006
Unisexuality has evolved repeatedly in flowering plants, but its genetic control is not understood in most cases. In maize (Zea mays), unisexual flower development is regulated by a short-chain dehydrogenase/reductase protein, TASSELSEED2 (TS2), but its role in other grass lineages is unknown.
Simon T, Malcomber, Elizabeth A, Kellogg
openaire   +2 more sources

Anatomy and ontogeny of unisexual flowers in dioecious Woonyoungia septentrionalis (Dandy) Law (Magnoliaceae)

Journal of Systematics and Evolution, 2009
Abstract  Woonyoungia septentrionalis (Dandy) Law is a dioecious species with unisexual flowers in Magnoliaceae. The floral morphology and structure of the species are conspicuously different from other species and are important to the study of floral phylogeny in this family.
Lin FU, Qing‐Wen ZENG, Jing‐Ping LIAO, Feng‐Xia XU   +3 more
openaire   +1 more source

SpMS1, a male sterility factor, interacts with SpAP1 to regulate unisexual flower development in dioecious spinach

Plant And Cell Physiology
Abstract The emergence of unisexual flower is an important event during plant evolution. The molecular mechanism underlying the formation of unisexual flowers remains unclear in dioecious spinach. In this study, we identified the spinach MALE STERILITY1 gene, SpMS1, which serves as a masculine factor to regulate male fertility and sex ...
Ning Li, Bingxin Wang, Xinran Shang, Qiangwei Yang, Liang Yang, Minjie Tao, Shoaib Muhammad, Ainong Shi, Chuanliang Deng   +8 more
openaire   +2 more sources