Variations in Seed Germination and Morphology among Populations of Salvia Columbariae Benth. In Southern California

Capon, Brian; Brecht, Patrick E.

doi:10.5642/aliso.19700702.09

Cited by 25 publications

(13 citation statements)

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“…This has been noted in particular habitats of many of the 19 local populations of Salvia columbariae from the southern Californian deserts to the coastal valleys of California (Capon and Brecht 1970). This has been noted in particular habitats of many of the 19 local populations of Salvia columbariae from the southern Californian deserts to the coastal valleys of California (Capon and Brecht 1970).…”

Section: Seed Predation and Seed Dispersal By Ants Birds And Mammalsmentioning

confidence: 88%

“…Each of 19 local populations observed in a study by Capon and Brecht (1970), and 10 populations observed in a later study (Capon et al 1978), are characterized as ecotypes with individual adaptations to their specific micro-climates along the approximately 30-mile transect. Each of 19 local populations observed in a study by Capon and Brecht (1970), and 10 populations observed in a later study (Capon et al 1978), are characterized as ecotypes with individual adaptations to their specific micro-climates along the approximately 30-mile transect.…”

Section: Species Eco-genotypes and Ecotypesmentioning

confidence: 99%

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Seed Germination in Desert Plants

Gutterman

1993

Adaptations of Desert Organisms

320

188

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PrefaceThis book is based on the author's 30 years of research in the desert, as well as on the research of others, on the dispersal and germination of annual angiospermae, geophytes and other perennial desert plants of the Negev Desert Highlands and the other deserts of Israel and the Sinai Peninsula. The findings are compared with the results of research that has been carried out in other hot deserts of the world. The focus of the book is on the extreme and unpredictable environmental conditions which influence the germination and survival of plants in the desert. These include the wide variation in the amount and distribution of rain and the differences in the length of the growing season from one year to the next, wide fluctuations in temperature, high salinity and the pressures of seed predation. The book presents ·an overview of the environmental factors influencing seed germination during plant development ~nd seed maturation, the mechanisms of seed dispersal and storage of the seed bank as well as those that affect germination during seed imbibition and seedling survival.The survival of plants under desert conditions is connected mainly with the germination mechanisms which ensure germination and seedling development at the right time and in a suitable place. Thus, during the plant life cycle the seed has the highest resistance to extreme environmental factors, whereas the seedling has the lowest. Are there special mechanisms in some species which are able to predict the best time and place for germination? It seems that there are two main directions in which evolution has taken place: 1. Plants with survival mechanisms that will enable seeds to be dispersed and/or germinate when the chance of seedling establishment is very high and the risk relatively low. Seeds of these plants only germinate after relatively large amounts of rain and, in many cases, have relatively large seeds which are well protected against many granivores. 2. In the opposite direction of evolution are species which produce tiny seeds in very large numbers, and many of these seeds germinate after even less than 10 mm of rainfall. These are condi-VI Preface tions of high risk for seedling establishment if additional rain does .not follow fairly quickly.One of the main topics considers what is special about the dispersal and germination of the seeds of plants that are found in deserts.The dispersal and germination strategies and mechanisms discussed focus mainly on annual plants in which germination is the most critical process before each growing season.Limited seed separation -synaptospermyis common among plant species inhabiting extreme deserts. Many synaptospermic species disperse their seeds by rain. At least two advantages of species with synaptospermic seed dispersal are seen particularly in extreme deserts: the retention of seeds in the favourable microhabitat where the mother plant had successfully completed its life cycle; and the protection of these seeds against seed collectors during the period from seed maturation to germi...

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Section: Seed Predation and Seed Dispersal By Ants Birds And Mammalsmentioning

confidence: 88%

Section: Species Eco-genotypes and Ecotypesmentioning

confidence: 99%

Seed Germination in Desert Plants

Gutterman

1993

Adaptations of Desert Organisms

320

188

View full text Add to dashboard Cite

show abstract

“…Data from this and a previous study (Capon and Brecht, 1970) suggest that such a distribution is not attributable to the adaptability of the species as a whole but to the species being composed of several 372 ALISO ecotypes, each characterized by having individual adaptability to a specific microclimate, particularly to prevailing seasonal temperatures as they correspond with various stages in the plant's life cycle. Geographic isolation of 26 populations in southern California studied to date, their relatively small sizes, and the uniformity of seed morphology within each lend support to the belief that they are genetically homogeneous units, maintained by inbreeding through self-pollination or localized cross-pollination (Visco and Capon, 1970).…”

Section: Discussionmentioning

confidence: 51%

“…in southern California, Capon and Brecht ( 1970) showed the occurrence of a wide range of germination responses to high temperature pretreatment of the seed. The results of that study indicated the existence of possible ecotypes within the species that represent specific physiological adaptations to microenvironments at the collection sites.…”

Section: Introductionmentioning

confidence: 99%

Germination Responses to Temperature Pretreatment of Seeds from Ten Populations of Salvia Columbariae in the San Gabriel Mountains and Mojave Desert, California

Capon¹,

Maxwell²,

Smith³

1978

aliso

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“…It is widely distributed in southern California from the desert to coastal zones and high elevations up to an altitude of 2100 m (Capon & Brecht, 1970). Golden chia seed matures in late spring.…”

Section: Introductionmentioning

confidence: 99%