| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Dep. of Plant Sciences, P.O. Box 210036, Univ. of Arizona, Tucson, AZ 85721-0036
* Corresponding author (kmarcum{at}ag.arizona.edu).
Heat stress is often a major problem in C3 (cool-season) turfgrasses during summer months, resulting in reduced turf quality and stand loss. Current germplasm screening for heat tolerance relies on field and whole-plant techniques, which are often inefficient and insensitive due to environmental interactions. A rapid, accurate procedure allowing simultaneous screening of large numbers of genotypes is needed. In vitro cell membrane thermostability (CMT) has been determined for a number of plants. The objectives of this study were to determine if differences in CMT exist among cultivars of Kentucky bluegrass (Poa pratensis L.), and if CMT can predict whole-plant heat tolerance of these cultivars. CMT was determined by subjecting leaf segments to progressive heat shock exposure times, and deriving cellular electrolyte leakage curves. Whole-plant heat tolerance was determined by subjecting plants to 41°C day/34°C night at 95% relative humidity for 62 d (Study 1) and 47 d (Study 2) in controlled-environment chambers. Relative percentage leaf firing and percentage shoot dry weight were determined weekly. CMT was negatively correlated with relative percentage leaf firing (r = –0.80) and positively with relative percentage shoot dry weight (r = 0.75), averaged over two experiments. CMT and whole-plant heat tolerance used as indicators demonstrated that cultivars BM-3 and Midnight were more heat tolerant than Lavang, Nugget, and Ryss. This is the first report showing that CMT can predict whole-plant heat tolerance among turfgrass cultivars. Being rapid, accurate, and requiring little space, CMT may offer turfgrass breeders an ideal method for screening large numbers of genotypes for heat tolerance.
Received for publication June 25, 1997.
This article has been cited by other articles:
|
|
 |
|
  J. Xu, J. Tian, F. C. Belanger, and B. Huang Identification and characterization of an expansin gene AsEXP1 associated with heat tolerance in C3 Agrostis grass species J. Exp. Bot., October 10, 2007; (2007) erm229v1. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 K. Su, D. J. Bremer, S. J. Keeley, and J. D. Fry Effects of High Temperature and Drought on a Hybrid Bluegrass Compared with Kentucky Bluegrass and Tall Fescue Crop Sci., September 1, 2007; 47(5): 2152 - 2161. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. L. Kauffman III, D. P. Kneivel, and T. L. Watschke Effects of a Biostimulant on the Heat Tolerance Associated with Photosynthetic Capacity, Membrane Thermostability, and Polyphenol Production of Perennial Ryegrass Crop Sci., January 22, 2007; 47(1): 261 - 267. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. M. Abraham, B. Huang, S. A. Bonos, and W. A. Meyer Evaluation of Drought Resistance for Texas Bluegrass, Kentucky Bluegrass, and Their Hybrids Crop Sci., September 1, 2004; 44(5): 1746 - 1753. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. S. Ebdon and K. L. Kopp Relationships between Water Use Efficiency, Carbon Isotope Discrimination, and Turf Performance in Genotypes of Kentucky Bluegrass during Drought Crop Sci., September 1, 2004; 44(5): 1754 - 1762. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
X. Liu and B. Huang Cytokinin Effects on Creeping Bentgrass Response to Heat Stress: II. Leaf Senescence and Antioxidant Metabolism Crop Sci., March 1, 2002; 42(2): 466 - 472. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Y. Jiang and B. Huang Protein Alterations in Tall Fescue in Response to Drought Stress and Abscisic Acid Crop Sci., January 1, 2002; 42(1): 202 - 207. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Y. Jiang and B. Huang Effects of Drought or Heat Stress Alone and in Combination on Kentucky Bluegrass Crop Sci., September 1, 2000; 40(5): 1358 - 1362. [Abstract] [Full Text]
|
|
|
|
|
|
X. Liu and B. Huang Heat Stress Injury in Relation to Membrane Lipid Peroxidation in Creeping Bentgrass Crop Sci., March 1, 2000; 40(2): 503 - 510. [Abstract] [Full Text]
|
|
|
|
|
|
A. M. Ismail and A. E. Hall Reproductive-Stage Heat Tolerance, Leaf Membrane Thermostability and Plant Morphology in Cowpea Crop Sci., November 1, 1999; 39(6): 1762 - 1768. [Abstract] [Full Text]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Vadose Zone Journal | |||
| Journal of Natural Resources and Life Sciences Education |
Soil Science Society of America Journal | ||||
| Journal of Plant Registrations | Journal of Environmental Quality |
The Plant Genome | |||
