Search Results

You are looking at 1 - 10 of 61 items for :

  • "cold-sensitive" x
Clear All
Free access

G. Yelenosky and J.C.V. Vu

Greenhouse-grown l-year-old sweet orange trees [Citrus sinensis (L.) Osbeck cv. Valencia] on cold-hardy trifoliate orange [Poncirus trifoliata (L.) Raf.] and cold-sensitive citron (C. medica L.) rootstocks were exposed to cold-acclimation conditions and freeze-tested at -6.7C for 4 hours in a temperature-programed walk-in freezer room. Nonhardened trees generally did not survive the freeze, whereas cold-hardened trees survived with no wood kill on either rootstock. Essentially, all leaves died or abscised during the subsequent 5 weeks in the greenhouse. Freeze survival did not separate rootstocks nor did supercooling in separate trials where Yalencia' wood reached –8.8C before apparent nucleation. Increases in concentration of carbohydrates and proline and decreases in water content in Yalencia' leaves during cold hardening were generally associated with increased freeze tolerance. Other tests, that matched 9-month-old seedlings of citron with trifoliate orange rootstock, showed clear differences in the superior cold acclimation of trifoliate orange over citron, which, however, performed better than expected.

Free access

Sharon Inch, Ed Stover, Randall Driggers and Richard F. Lee

production. Most commercial citrus cultivars are cold-sensitive ( Soost and Roose, 1996 ) and damage will often result when exposed to temperatures below –2.2 °C ( Yelenosky, 1985 ). In the 1980s there were multiple severe freeze events in Florida (1981, 1982

Full access

David H. Suchoff, Penelope Perkins-Veazie, Heike W. Sederoff, Jonathan R. Schultheis, Matthew D. Kleinhenz, Frank J. Louws and Christopher C. Gunter

cold-sensitive elite tomato lines onto cold-tolerant rootstocks. The high-altitude wild tomato relative S. habrochaites is known to be more tolerant of suboptimal temperatures ( Venema et al., 1999 , 2005 ) and has been the subject of numerous

Free access

Bandara Gajanayake, Brian W. Trader, K. Raja Reddy and Richard L. Harkess

than minimum CTRI + 3.0 sd ), moderately cold-tolerant (minimum CTRI + 3.0 sd to greater than minimum CTRI + 2.0 sd ), moderately cold-sensitive (minimum CTRI + 2.0 sd and greater than minimum CTRI + 1.0 sd ), and cold-sensitive (minimum CTRI to

Full access

Zhengrong Hu, Erick Amombo, Margaret Mukami Gitau, Aoyue Bi, Huihui Zhu, Liang Zhang, Liang Chen and Jinmin Fu

response in bermudagrass is urgent and crucial for grass engineering ( Fagerness et al., 2002 ; Shi et al., 2014 ; Zhang et al., 2008 , 2011a , 2011b ). This study was designed to investigate the differences of chilling stress response between the cold-sensitive

Free access

James J. Polashock, Rajeev Arora, Yanhui Peng, Dhananjay Naik and Lisa J. Rowland

and freezing tolerance ( Thomashow, 1999 ). Here, our objectives were to isolate a full-length CBF transcription factor from highbush blueberry, to compare expression of the putative CBF gene in floral buds of cold-tolerant and cold-sensitive

Full access

Krista Shellie, Jacob Cragin and Marcelo Serpe

years and lower SSC than both cultivars in the warmest growing season. The high incidence of vine injury and imbalance of fruit maturity indices in ‘Graciano’, ‘Aglianico’, and ‘Aleatico’ indicate that these cultivars are cold sensitive and better suited

Free access

Georgia Ntatsi, Dimitrios Savvas, Georgia Ntatsi, Hans-Peter Kläring and Dietmar Schwarz

appears to be cold-sensitive ( Domínguez et al., 2005 ; Venema et al., 2008 ). The two rootstocks tested were grafted to the same commercial tomato cultivar Kommeet. Moreover, a control treatment with 3) self-grafted ‘Kommeet’ plants was applied to avoid

Free access

Xunzhong Zhang, Kehua Wang and Erik H. Ervin

‘Princess’ (relatively cold-sensitive), were used for this study. Mature bermudagrass plugs (10 cm diameter × 5 cm deep) were taken from field plots at the Virginia Tech Turfgrass Research Center, Blacksburg, VA, on 2 Aug. 2007 and grown in pots (12.5 cm

Free access

Barbara M. Reed

Medium-term in vitro cold storage of Rubus germplasm was investigated using various temperatures, photoperiods, and storage containers. Shoot cultures of several Rubus taxa were grown either in tissue-culture hags or 20 × 150-mm glass tubes. Cultures stored at 10C in darkness were in poor condition after 6 months. Overall survival and condition ratings were significantly better for bags than tubes when cultures were kept at 4C. Contamination was present in 14% of the tubes, but only 3% of the bags. Addition of a 12-hour photoperiod to 4C storage significantly improved both condition ratings and survival percentages of many individual genotypes. Evaluation of the 250-accession germplasm collection after 12 months at 4C (dark) showed 92% of accessions in bags and 85% in tubes in suitable condition to remain in storage. Storage of cold-sensitive genotypes in tissue-culture bags at 25C with a 16-hour daylength was extended to 9 months when the MS-medium nitrogen level was reduced to 25% of standard concentration. Survival of `Mandarin' raspberry stored for 9 months improved from 40% at 4C (100% N) to 90% at 25C (25% N). Results of these studies suggest that most Rubus germplasm can be stored safely at 4C with 12 hours of light. Plastic tissue-culture bags are preferred over tubes due to higher survival and lower contamination rates. Storage at 25C on reduced-nitrogen medium is an alternative method for cold-sensitive genotypes.