Photosynthetic Rate and Stomatal Conductance are Related to Heat Tolerance in Pima Cotton

Persistent Link:
http://hdl.handle.net/10150/208325
Title:
Photosynthetic Rate and Stomatal Conductance are Related to Heat Tolerance in Pima Cotton
Author:
Cornish, Katrina; Lu, Phenmin; Radin, John W.; Turcotte, Edgar L.; Zeiger, Eduardo
Issue Date:
1991
Publisher:
College of Agriculture, University of Arizona (Tucson, AZ)
Journal:
Cotton: A College of Agriculture Report
Abstract:
Breeding for high yield in hot environments (heat tolerance) has tripled the yield of Pirna cotton since 1949. We compared six strains (one primitive non-cultivated line, four cultivars representing advancing stages in the breeding process, and one unreleased advanced line) for their gas exchange properties in the greenhouse. Both photosynthetic rate and stomatal conductance increased with improving genetic yield potential. Photosynthetic rate was enhanced more in the morning than in the afternoon. Stomatal conductance did not limit photosynthesis; rather, the changes resulted from alterations of characteristics of the green mesophyll cells. There is no evidence that increased yield results from the enhanced photosynthetic rates of single leaves. However, the increased stomatal conductance in modem lines was also expressed in the field in 1990, allowing increased transpiration rate and evaporative cooling of leaves. Heat tolerance in Pima cotton may be related to the ability of plants to cool themselves by transpiration.
Keywords:
Agriculture -- Arizona; Cotton -- Arizona; Cotton -- Physiology; Cotton -- Growth regulators
Series/Report no.:
370087; Series P-87

Full metadata record

DC FieldValue Language
dc.titlePhotosynthetic Rate and Stomatal Conductance are Related to Heat Tolerance in Pima Cottonen_US
dc.contributor.authorCornish, Katrinaen_US
dc.contributor.authorLu, Phenminen_US
dc.contributor.authorRadin, John W.en_US
dc.contributor.authorTurcotte, Edgar L.en_US
dc.contributor.authorZeiger, Eduardoen_US
dc.date.issued1991-
dc.publisherCollege of Agriculture, University of Arizona (Tucson, AZ)en_US
dc.identifier.journalCotton: A College of Agriculture Reporten_US
dc.description.abstractBreeding for high yield in hot environments (heat tolerance) has tripled the yield of Pirna cotton since 1949. We compared six strains (one primitive non-cultivated line, four cultivars representing advancing stages in the breeding process, and one unreleased advanced line) for their gas exchange properties in the greenhouse. Both photosynthetic rate and stomatal conductance increased with improving genetic yield potential. Photosynthetic rate was enhanced more in the morning than in the afternoon. Stomatal conductance did not limit photosynthesis; rather, the changes resulted from alterations of characteristics of the green mesophyll cells. There is no evidence that increased yield results from the enhanced photosynthetic rates of single leaves. However, the increased stomatal conductance in modem lines was also expressed in the field in 1990, allowing increased transpiration rate and evaporative cooling of leaves. Heat tolerance in Pima cotton may be related to the ability of plants to cool themselves by transpiration.en_US
dc.subjectAgriculture -- Arizonaen_US
dc.subjectCotton -- Arizonaen_US
dc.subjectCotton -- Physiologyen_US
dc.subjectCotton -- Growth regulatorsen_US
dc.identifier.urihttp://hdl.handle.net/10150/208325-
dc.relation.ispartofseries370087en_US
dc.relation.ispartofseriesSeries P-87en_US
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