HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (4) Citing Articles via Google Scholar Google Scholar Articles by Basal, H. Articles by Hemphill, J. K. Search for Related Content PubMed Articles by Basal, H. Articles by Hemphill, J. K. Agricola Articles by Basal, H. Articles by Hemphill, J. K. Related Collections Water Stress Cotton

CROP BREEDING, GENETICS & CYTOLOGY

Seedling Drought Tolerance in Upland Cotton

^a Dep. of Crop Sciences, Faculty of Agriculture, Adnan Menderes Univ., Aydin 09100 Turkey
^b Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843
^c Dep. of Forest Science, Texas A&M Univ., College Station, TX 77843

^* Corresponding author (cwsmith{at}tamu.edu)

Combining root morphological and plant physiological traits associated with drought tolerance should result in improved drought resistance in cotton (Gossypium hirsutum L.). This study was designed to evaluate the response of root growth of selected Converted Race Stocks (CRS), TAM94L-25, and ‘Lankart 142’ (LK 142) under water stress and nonstressed conditions, and to compare their excised leaf water loss (ELWL). Two putative seedling drought tolerant and two putative nonseedling drought tolerant CRS lines, plus TAM94L-25 and LK 142, were grown with and without moisture stress in a greenhouse at College Station, TX, in 2002 and 2003. The robust rooting CRS, M-9044-0031-R and M-8744-0175-R, had longer tap root length (RL), higher lateral root number (LRN), greater total root dry weight (TRDW), greater root weight per unit length of tap root (W/L), and greater shoot dry weight (SDW) than the nonrobust CRS M-9044-0045-NR and M-9044-0057-NR, and LK 142 regardless of water regime. Two cycles of seedling drought resulted in an increase in LRN in M-9044-0057-NR, TAM94L-25, and LK 142. SDW and TRDW were highly correlated and SDW was associated with W/L. The excised leaf water loss (ELWL) tended to be greater in the NR CRS lines when measured at 30-m intervals for 8 h. Results suggested (i) that root parameters, initial water content (IWC), and ELWL, could be used as a reliable selection criteria for drought tolerance and (ii) that day-neutral CRS accessions could be used as a source of useful genetic variability for a cotton drought tolerance improvement program.

Abbreviations: ELWL, excised leaf water loss • IWC, initial water content • LRN, lateral root number • RL, root length • SDW, shoot dry weight • SDWR, shoot dry weight reduction • TRDW, total root dry weight • W/L, root weight per unit length of tap root

This article has been cited by other articles:

				J. C. McCarty, J. Wu, and J. N. Jenkins Use of Primitive Derived Cotton Accessions for Agronomic and Fiber Traits Improvement: Variance Components and Genetic Effects Crop Sci., January 22, 2007; 47(1): 100 - 110. [Abstract] [Full Text] [PDF]

				P. S. Longenberger, C. W. Smith, P. S. Thaxton, and B. L. McMichael Development of a Screening Method for Drought Tolerance in Cotton Seedlings Crop Sci., September 8, 2006; 46(5): 2104 - 2110. [Abstract] [Full Text] [PDF]