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overall senescence - senescenceonly the parts above the ground level ie the aerial parts die whereas the underground parts survive for example
senescenceplants begin their development after seed germination they grow flower and finally senesce and die the period from the start to death is
fast response - biological responsessome of the fast responses are discussed belowit was found that when mung bean root tips were kept in a specific
biological responses controlled by phytochromephytochrome responses are those which are controlled reversibly by red and far-red light these can be
phytochrome - development of plantyou know that plants capture light energy during photosynthesis now you are familiarised with another important and
biochemical changesmany workers have tried to follow the biochemical changes that precede flowering and result in meristems which give rise to
chilling and flower inductionsome plants flower only after passing a winter season for example winter wheat is sown in the autumn for harvest in the
day-neutral plants besides sdp and ldp those plants that flower irrespective of the length of light are called day-neutral plants for these there
long-day plants ldp - plant responses to light-dark cyclesthe definition of this is exactly opposite to short-day plant that is those plants which
short-day plants sdp - plant responses to light-dark cyclesthese plants only flower or flower more profusely and rapidly when given less than a
flowering - development of plantone of the major changes that occur during the life cycle of a plant is the transition from vegetative stage to the
dormant vegetative structuresyou have learnt that light a period of chilling or application of gibberellin often breaks seed dormancy and stimulates
metabolic eventslet us now examine the changes that occur in the seeds after they imbibe water in general the most important metabolic events are
seed germination - development of plantthe environmental factors that influence the germination of seeds are water availability optimal light
phases of seed formationthe process of seed formation can be divided into two phases the division phase in which fertilised egg divides mitotically
vegetative development - developmentthe process of growth and differentiation of cells into organs and organisms is often termed development for
vegetative development - morphogenesisthis term is coined for the process leading to and determining the form and structure of organs it is used
vegetative development - differentiationit is referred to as qualitative changes that lead to increased specialisation for example the formation of
vegetative development - growthit is quantitative and irreversible change it reflects an increase in size and volume of an organism for example the
development and differentiation of a flowering plantthe developmental phases of a flowering plant involve seed germination vegetative growth
procedure of hormone actall plant hormones show extraordinary varied complex effects in controlling plant growth and development extrapolation from
growth regulatorsbesides the major five hormones polyamines can also exert regulatory control over growth and development at micromolar
roles of abscisic acidabscisic acid aba is a particularly interesting hormone with regard to the regulation of its own levels its levels rise and
ethylene - plant hormonesamongst hormones in both plant and animal kingdoms ethylene a gaseous hydrocarbon is unique despite its chemical simplicity
features of plant hormonesthe following are the important features of the role of plant hormones in growth and development the hormone may initiate