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Titolo:
HEAT TOLERANCE OF CONTRASTING COWPEA LINES IN SHORT AND LONG DAYS
Autore:
EHLERS JD; HALL AE;
Indirizzi:
UNIV CALIF RIVERSIDE,DEPT BOT & PLANT SCI RIVERSIDE CA 92521
Titolo Testata:
Field crops research
fascicolo: 1-2, volume: 55, anno: 1998,
pagine: 11 - 21
SICI:
0378-4290(1998)55:1-2<11:HTOCCL>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
NIGHT AIR-TEMPERATURE; UNGUICULATA L WALP; REPRODUCTIVE RESPONSES; VIGNA-UNGUICULATA; FLORAL DEVELOPMENT; CLASSIFICATION; PHOTOPERIOD; INJURY; STRESS; FIELD;
Keywords:
VIGNA UNGUICULATA; HEAT TOLERANCE; DAYLENGTH; PHOTOPERIOD; POD SET; SEEDS PER POD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
J.D. Ehlers e A.E. Hall, "HEAT TOLERANCE OF CONTRASTING COWPEA LINES IN SHORT AND LONG DAYS", Field crops research, 55(1-2), 1998, pp. 11-21

Abstract

High-temperature damage to reproductive processes of cowpea (Vigna unguiculata L. Walp.) occurs when minimum night air temperatures are greater than 20 degrees C. The extent of damage is strongly influenced byphotoperiod. Genes conferring heat tolerance under hot long-day environments have been identified in cowpea, and breeding Lines with this trait have been developed. Genetic variability within cowpea germplasm for heat tolerance has not been assessed in short days. The objectivesof this study were to determine if the heat-tolerant accessions and breeding lines developed from them under hot long-day conditions also exhibit heat tolerance under hot short-day conditions. In addition, we evaluated the heat tolerance of 48 lines that do not flower in hot long-day conditions because of sensitivity to heat or photoperiod. Three short-day experiments and one long-day experiment were conducted in greenhouses with average daily minimum and maximum air temperatures of 27 and 36 degrees C, respectively. Simultaneously, moderate-temperatureshort-day experiments were conducted in nearby greenhouses with average daily minimum and maximum air temperatures of 18 and 32 degrees C, respectively. Days to first flower, pods per peduncle, total number ofpods, and grain yield were determined in all experiments. Individual seed weight and seeds per pod were determined for two of the three hotshort-day and moderate-temperature short-day experiments. Heat-tolerant lines that had been selected under hot long-day conditions had larger than average grain yield (i.e. heat tolerance) under hot short days. Several Lines bred for high grain yield under hot tropical conditions had heat tolerance under short days but not under long days, whereasmany cultivars developed under cooler tropical conditions did not exhibit heat tolerance. In hot short-day environments, grain yield was positively correlated with pods per peduncle and number of pods per plant, indicating the importance of these traits for conferring heat tolerance in these lines. Most lines experienced substantial heat-induced reductions in number of seeds per pod, even though there were no strongindications of carbohydrate source limitations. Two of the heat-tolerant lines, B89-600 and TN88-63, did not exhibit heat-induced reductions in number of seeds per pod in hot short days, however, and representadditional sources of heat tolerance that would further enhance grainyield in hot production zones. (C) 1998 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 06:56:22