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Research ArticleEnvironmental and Stress Physiology
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Homeohydrous (Recalcitrant) Seeds: Dehydration, the State of Water and Viability Characteristics in Landolphia kirkii

N. W. Pammenter, Christina W. Vertucci, Patricia Berjak
N. W. Pammenter
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Christina W. Vertucci
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Patricia Berjak
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Published August 1991. DOI: https://doi.org/10.1104/pp.96.4.1093

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Abstract

Differential scanning calorimetry was used to study the relationships among drying rate, desiccation sensitivity, and the properties of water in homeohydrous (recalcitrant) seeds of Landolphia kirkii. Slow drying of intact seeds to axis moisture contents of approximately 0.9 to 0.7 gram/gram caused lethal damage, whereas very rapid (flash) drying of excised embryonic axes permitted removal of water to approximately 0.3 gram/gram. The amount of nonfreezable water in embryonic axes (0.28 gram H2O/gram dry mass) did not change with drying rate and was similar to that of desiccation-tolerant seeds. These results suggest that the amount of nonfreezable water per se is not an important factor in desiccation sensitivity. However, flash drying that removed all freezable water damaged embryonic axes. Differences between desiccation-sensitive and -tolerant seeds occur at two levels: (a) tolerant seeds naturally lose freezable water, and sensitive seeds can lose this water without obvious damage only if it is removed very rapidly; (b) tolerant seeds can withstand the loss of a substantial proportion of nonfreezable water, whereas sensitive seeds are damaged if nonfreezable water is removed.

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Homeohydrous (Recalcitrant) Seeds: Dehydration, the State of Water and Viability Characteristics in Landolphia kirkii
N. W. Pammenter, Christina W. Vertucci, Patricia Berjak
Plant Physiology Aug 1991, 96 (4) 1093-1098; DOI: 10.1104/pp.96.4.1093

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Homeohydrous (Recalcitrant) Seeds: Dehydration, the State of Water and Viability Characteristics in Landolphia kirkii
N. W. Pammenter, Christina W. Vertucci, Patricia Berjak
Plant Physiology Aug 1991, 96 (4) 1093-1098; DOI: 10.1104/pp.96.4.1093
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Plant Physiology
Vol. 96, Issue 4
August 1991
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More in this TOC Section

  • Inactivation of Photosystems I and II in Response to Osmotic Stress in Synechococcus. Contribution of Water Channels
  • Is There a Role for Oligosaccharides in Seed Longevity? An Assessment of Intracellular Glass Stability
  • Selenium Assimilation and Volatilization from Dimethylselenoniopropionate by Indian Mustard
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