What is autonomous selfing in plants?
What is autonomous selfing in plants?
Selfing can occur within flowers (autogamy) or among flowers on the same plant (geitonogamy); autogamy can be facilitated by pollinators or occur autonomously in the absence of pollinators.
What is autonomous flowering?
The autonomous pathway comprises a combination of factors involved in RNA processing and epigenetic regulation that downregulate the floral repressor, FLOWERING LOCUS C (FLC). However, components of the autonomous pathway are more widely conserved in plant species other than Arabidopsis than is FLC.
What is seed quiescence?
Quiescence is a state of suspended growth of the embryo, or a resting condition of the seed. It involves factors in the seed itself which put it into a resting state (such as dessication). Quiescent embryos will resume growth at any time upon exposure to favorable conditions (water, oxygen and warmth).
What is germination of seed answer?
germination, the sprouting of a seed, spore, or other reproductive body, usually after a period of dormancy. The absorption of water, the passage of time, chilling, warming, oxygen availability, and light exposure may all operate in initiating the process.
Is vallisneria pollinated by water?
(iv) In Vallisneria, female flowers reach the surface of water and receive the pollen grains, whereas in Zostera, female flowers remain submerged and receive pollen grains under water.
Which gene is implicated in autonomous control of flowering?
PCFS4 was identified as a new component in the autonomous flowering pathway that regulates the alternative polyadenylation of FCA to promote flowering (Xing et al. 2008).
Do plants have circadian rhythm?
Abstract. Plants have internal timekeeper known as a circadian clock that anticipates environmental cues such as light, temperature and regulates photoperiodic rhythmicity for the proper growth and fitness of the plants.
What is para dormancy?
Paradormancy refers to the period of bud dormancy induced by a structure other than the buds, primarily related to the phenomenon of apical dominance [1, 2]. During the subsequent period; endodormancy, development and growth are controlled by the perception within the bud of an environmental signal.
What is Skoto dormancy?
Thermo – Dormancy due to temperature. Skoto – Light; Photo – Quality of light and Osmotic – stress or high osmotic stress prevents germination. According to Harper (1977) dormancy may be classified into following, Nature of origination i.
What is germination PPT?
Germination is the growth of a plant contained within a seed; it results in the formation of the seedling, it is also the process of reactivation of metabolic machinery of the seed resulting in the emergence of radical and plumule.
What is the neuter flower?
Neuter flowers have undeveloped or nonfunctional sexual organs. They have pistils and stamens that are nonfunctional or absent. The flowers are androgynous and the plants reproduce asexually. Ray florets of sunflower are neuter flowers, disc florets are bisexual, also in some more Asteraceae, e.g. Centaurea.