Patricia Berjak

Summary

Affiliation: University of KwaZulu-Natal
Country: South Africa

Publications

  1. ncbi request reprint Cryopreservation of embryonic axes of selected amaryllid species
    - Sershen
    Department of Biological and Conservation Sciences, University of KwaZulu Natal, Durban, South Africa
    Cryo Letters 28:387-99. 2007
  2. pmc From Avicennia to Zizania: seed recalcitrance in perspective
    Patricia Berjak
    School of Biological and Conservation Sciences, University of KwaZulu Natal, Durban, South Africa
    Ann Bot 101:213-28. 2008
  3. ncbi request reprint Global voices of science. Protector of the seeds: seminal reflections from southern Africa
    Patricia Berjak
    Department of Life and Environmental Sciences, University of KwaZulu Natal, Durban, South Africa
    Science 307:47-9. 2005
  4. doi request reprint Cryo-tolerance of zygotic embryos from recalcitrant seeds in relation to oxidative stress--a case study on two amaryllid species
    - Sershen
    School of Life Sciences, University of KwaZulu Natal, South Ring Road, Westville Campus, Durban 4001, South Africa
    J Plant Physiol 169:999-1011. 2012
  5. doi request reprint Rate of dehydration, state of subcellular organisation and nature of cryoprotection are critical factors contributing to the variable success of cryopreservation: studies on recalcitrant zygotic embryos of Haemanthus montanus
    - Sershen
    Plant Germplasm Conservation Research, School of Biological and Conservation Sciences, Durban, South Africa
    Protoplasma 249:171-86. 2012
  6. doi request reprint The effects of various parameters during processing for cryopreservation on the ultrastructure and viability of recalcitrant zygotic embryos of Amaryllis belladonna
    - Sershen
    Plant Germplasm Conservation Research, School of Biological and Conservation Sciences, University of KwaZulu Natal Westville Campus, Durban, South Africa
    Protoplasma 249:155-69. 2012
  7. ncbi request reprint The influence of water content, cooling and warming rate upon survival of embryonic axes of Poncirus trifoliata (L.)
    James Wesley-Smith
    School of Life and Environmental Sciences, University of Natal, Durban, South Africa
    Cryo Letters 25:129-38. 2004
  8. ncbi request reprint The effects of desiccation and exposure to cryogenic temperatures on embryonic axes of Landolphia kirkii
    Provain Kistnasamy
    Provain School of Biological and Conservation Sciences, University of KwaZulu Natal Westville Campus, Durban, South Africa
    Cryo Letters 32:28-39. 2011
  9. doi request reprint Differential drying rates of recalcitrant Trichilia dregeana embryonic axes: a study of survival and oxidative stress metabolism
    Boby Varghese
    School of Biological and Conservation Sciences, University of KwaZulu Natal, South Ring Road, Westville Campus, Durban 4001, South Africa
    Physiol Plant 142:326-38. 2011
  10. doi request reprint Increased drying rate lowers the critical water content for survival in embryonic axes of English oak (Quercus robur L.) seeds
    Tobias M Ntuli
    Plant Germplasm Conservation Research, School of Biological and Conservation Sciences, University of KwaZulu Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa
    J Integr Plant Biol 53:270-80. 2011

Collaborators

Detail Information

Publications17

  1. ncbi request reprint Cryopreservation of embryonic axes of selected amaryllid species
    - Sershen
    Department of Biological and Conservation Sciences, University of KwaZulu Natal, Durban, South Africa
    Cryo Letters 28:387-99. 2007
    ....
  2. pmc From Avicennia to Zizania: seed recalcitrance in perspective
    Patricia Berjak
    School of Biological and Conservation Sciences, University of KwaZulu Natal, Durban, South Africa
    Ann Bot 101:213-28. 2008
    ..As the characteristics of seeds of an increasing number of species are elucidated, non-orthodox seed behaviour is emerging as considerably more commonplace--and its basis far more complex--than previously suspected...
  3. ncbi request reprint Global voices of science. Protector of the seeds: seminal reflections from southern Africa
    Patricia Berjak
    Department of Life and Environmental Sciences, University of KwaZulu Natal, Durban, South Africa
    Science 307:47-9. 2005
  4. doi request reprint Cryo-tolerance of zygotic embryos from recalcitrant seeds in relation to oxidative stress--a case study on two amaryllid species
    - Sershen
    School of Life Sciences, University of KwaZulu Natal, South Ring Road, Westville Campus, Durban 4001, South Africa
    J Plant Physiol 169:999-1011. 2012
    ....
  5. doi request reprint Rate of dehydration, state of subcellular organisation and nature of cryoprotection are critical factors contributing to the variable success of cryopreservation: studies on recalcitrant zygotic embryos of Haemanthus montanus
    - Sershen
    Plant Germplasm Conservation Research, School of Biological and Conservation Sciences, Durban, South Africa
    Protoplasma 249:171-86. 2012
    ..The outcomes of this study are considered particularly in terms of the stresses imposed by prolonged, relatively slow dehydration and ultimate water contents, on embryos showing considerable metabolic activity...
  6. doi request reprint The effects of various parameters during processing for cryopreservation on the ultrastructure and viability of recalcitrant zygotic embryos of Amaryllis belladonna
    - Sershen
    Plant Germplasm Conservation Research, School of Biological and Conservation Sciences, University of KwaZulu Natal Westville Campus, Durban, South Africa
    Protoplasma 249:155-69. 2012
    ..At the other extreme, no embryos survived LN exposure when sucrose cryoprotected. The study relates the cumulative effects of subcellular abnormality and declining viability, in relation to experimental parameters for cryopreservation...
  7. ncbi request reprint The influence of water content, cooling and warming rate upon survival of embryonic axes of Poncirus trifoliata (L.)
    James Wesley-Smith
    School of Life and Environmental Sciences, University of Natal, Durban, South Africa
    Cryo Letters 25:129-38. 2004
    ..The ability to cool rapidly with increasing hydration is balanced with an increasing limitation to dissipate heat fast enough to prevent severe damage...
  8. ncbi request reprint The effects of desiccation and exposure to cryogenic temperatures on embryonic axes of Landolphia kirkii
    Provain Kistnasamy
    Provain School of Biological and Conservation Sciences, University of KwaZulu Natal Westville Campus, Durban, South Africa
    Cryo Letters 32:28-39. 2011
    ..The use of slow cooling rates is promising for cryopreservation of mature axes of L. kirkii, but only when excised with a portion of each cotyledon left attached...
  9. doi request reprint Differential drying rates of recalcitrant Trichilia dregeana embryonic axes: a study of survival and oxidative stress metabolism
    Boby Varghese
    School of Biological and Conservation Sciences, University of KwaZulu Natal, South Ring Road, Westville Campus, Durban 4001, South Africa
    Physiol Plant 142:326-38. 2011
    ..It is also suggested that the reduction of viability in rapidly dried EAs at very low WCs appears to be a non-oxidative process...
  10. doi request reprint Increased drying rate lowers the critical water content for survival in embryonic axes of English oak (Quercus robur L.) seeds
    Tobias M Ntuli
    Plant Germplasm Conservation Research, School of Biological and Conservation Sciences, University of KwaZulu Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa
    J Integr Plant Biol 53:270-80. 2011
    ..The results presented are consistent with rapid dehydration reducing the accumulation of damage resulting from desiccation induced aqueous-based deleterious reactions...
  11. doi request reprint Effects of cryopreservation of recalcitrant Amaryllis belladonna zygotic embryos on vigor of recovered seedlings: a case of stress 'hangover'?
    Patricia Berjak
    School of Biological and Conservation Sciences, University of KwaZulu Natal, Durban, 4041, South Africa
    Physiol Plant 139:205-19. 2010
    ..These results suggest that seedlings recovered from partially dried and cryopreserved embryos were less vigorous and more susceptible to hydraulic failure than those from fresh ZEs...
  12. ncbi request reprint Non-equilibrium cooling of Poncirus trifoliata (L.) embryonic axes at various water contents
    James Wesley-Smith
    School of Life and Environmental Sciences, University of Natal, Durban, South Africa
    Cryo Letters 25:121-8. 2004
    ..Quantifying these rates allows the relationship between cooling rate, water content and survival of hydrated embryonic axes to be explored...
  13. doi request reprint Increasing the rate of drying reduces metabolic imbalance, lipid peroxidation and critical water content in radicles of garden pea (Pisum sativum L.)
    Tobias M Ntuli
    Plant Germplasm Conservation Research, School of Life Sciences, University of KwaZulu Natal, Durban, South Africa
    Biol Res 46:121-30. 2013
    ..In addition, they show that radicles are a useful model to study desiccation sensitivity in plant tissues. ..
  14. ncbi request reprint Cryopreservation, encapsulation and promotion of shoot production of embryonic axes of a recalcitrant species Ekebergia capensis, Sparrm
    Rosa Perán
    School of Biological and Conservation Sciences, University of KwaZulu Natal, Durban, South Africa
    Cryo Letters 27:5-16. 2006
    ....
  15. ncbi request reprint Development of cycad ovules and seeds. 2. Histological and ultrastructural aspects of ontogeny of the embryo in Encephalartos natalensis (Zamiaceae)
    Wynston Ray Woodenberg
    School of Life Sciences, University of KwaZulu Natal Westville Campus, Durban, 4001, South Africa
    Protoplasma 251:797-816. 2014
    ....
  16. ncbi request reprint A study of some biochemical and histopathological responses of wet-stored recalcitrant seeds of Avicennia marina infected by Fusarium moniliforme
    Vesselina S Anguelova-Merhar
    School of Life and Environmental Sciences, University of Natal, Durban, 4041 South Africa
    Ann Bot 92:401-8. 2003
    ..The results suggest that, although the recalcitrant seeds of A. marina elaborate some antifungal enzymes, there is a lack of effective defence strategies that might lead to successful responses against fungal infections...