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Effects of mechanical stress or abscisic acid on growth, water status and leaf abscisic acid content of eggplant seedlingsContainer-grown eggplant (Solanum melongena L. var esculentum Nees. 'Burpee's Black Beauty') seedlings were conditioned with brief, periodic mechanical stress or abscisic acid (ABA) in a greenhouse prior to outdoor exposure. Mechanical stress consisted of seismic (shaking) or thigmic (stem flexing) treatment. Exogenous ABA (10(-3) or 10(-4)M) was applied as a soil drench 3 days prior to outdoor transfer. During conditioning, only thigmic stress reduced stem elongation and only 10(-3) M ABA reduced relative growth rate (RGR). Both conditioning treatments increased leaf specific chlorophyll content, but mechanical stress did not affect leaf ABA content. Outdoor exposure of unconditioned eggplant seedlings decreased RGR and leaf-specific chlorophyll content, but tended to increase leaf ABA content relative to that of plants maintained in the greenhouse. Conditioning did not affect RGR of plants subsequently transferred outdoors, but did reduce stem growth. Seismic stress applied in the greenhouse reduced dry weight gain by plants subsequently transferred outdoors. Mechanical stress treatments increased leaf water potential by 18-25% relative to that of untreated plants.
Document ID
20040089587
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Latimer, J. G.
(Purdue University West Lafayette, IN 47907, United States)
Mitchell, C. A.
Date Acquired
August 21, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Scientia horticulturae
Volume: 36
ISSN: 0304-4238
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NSG 7278
CONTRACT_GRANT: NGT1-50048
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Plant Biology
NASA Discipline Number 40-30
NASA Program Space Biology
Non-NASA Center

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