In other multi –species studies, however, no result it’s from pressure volume measurements correlated well to field observation of drought resistance (Bannister 1986; Bannister and Kissel 1986; Abrams et al 1990), or even to minimal water potentials (Davis and Mooney 1986, a, b). A variety of contrasting, compensating physiological changes may occur as water is lost; e.g., open stomata allow water potential to decline while photosynthesis continues, or closed stomata prevent both low and photosynthesis (Bannister and Kissel 1986; Schulz et al 1987; Guehl et al 1991).
The basal water potential as predawn is an important, useful measurement of plant water status (Hinckley et al 1978; Murphy and Ferrell, 1982; Waring and Schlensinger 1985; Davis …show more content…
Phenology involves study of the response of living organisms to seasonal and climatic changes (e.g. temperature and precipitation) of the environment in which they live (Moza and Bhatnagar, 2005). Phenological observations provide a background for information on functional rhythms of plants and plants communities. Phenology is the study of nature of plant events in response to seasonal and climatic changes to the environment (Singh et. al, 2015). Phenology involves precise documentation of timing and duration of different phenological events at species level, their interrelations and possible causal links between environmental variables and phenology (Singh and Kushwaha, …show more content…
The immediate cause of a phenological event is the organism’s detection of the environmental cues which trigger the appropriate response, e.g. a flowering response to short or long days (Bernier et. al, 1981). Physiological responses are in principle easy to explore experimentally, though with so many potential cues operating simultaneously in nature, it may not be easy to identify the relevant ones. The long-term cause of the timing of a life-history event is the selection pressure which has resulted in the evolution of the plant’s idiosyncratic phenology. These pressures may range from abiotic constraints (e.g., seasonally unfavorable temperatures, erratic rainfall), to biotic pressures such as seasonal presence of predators, pollinators and dispersers. Many phenological studies are basically concerned with answering the question ‘Why now, rather than earlier or later?’ The timing of a particular life-history event may be the result of selection for exploiting a favorable slot sandwiched between two more hazardous periods. Climate indicators such as variation in temperature and rainfall closely influence phenophases of different tree species (Thakur et. al, 2008). Based on its well-known variation with the annual course of weather elements, plant phenology might be expected to
The basal water potential as predawn is an important, useful measurement of plant water status (Hinckley et al 1978; Murphy and Ferrell, 1982; Waring and Schlensinger 1985; Davis …show more content…
Phenology involves study of the response of living organisms to seasonal and climatic changes (e.g. temperature and precipitation) of the environment in which they live (Moza and Bhatnagar, 2005). Phenological observations provide a background for information on functional rhythms of plants and plants communities. Phenology is the study of nature of plant events in response to seasonal and climatic changes to the environment (Singh et. al, 2015). Phenology involves precise documentation of timing and duration of different phenological events at species level, their interrelations and possible causal links between environmental variables and phenology (Singh and Kushwaha, …show more content…
The immediate cause of a phenological event is the organism’s detection of the environmental cues which trigger the appropriate response, e.g. a flowering response to short or long days (Bernier et. al, 1981). Physiological responses are in principle easy to explore experimentally, though with so many potential cues operating simultaneously in nature, it may not be easy to identify the relevant ones. The long-term cause of the timing of a life-history event is the selection pressure which has resulted in the evolution of the plant’s idiosyncratic phenology. These pressures may range from abiotic constraints (e.g., seasonally unfavorable temperatures, erratic rainfall), to biotic pressures such as seasonal presence of predators, pollinators and dispersers. Many phenological studies are basically concerned with answering the question ‘Why now, rather than earlier or later?’ The timing of a particular life-history event may be the result of selection for exploiting a favorable slot sandwiched between two more hazardous periods. Climate indicators such as variation in temperature and rainfall closely influence phenophases of different tree species (Thakur et. al, 2008). Based on its well-known variation with the annual course of weather elements, plant phenology might be expected to