Search Results

You are looking at 131 - 140 of 4,776 items for :

  • All content x
Clear All
Free access

Juan Bernardo Pérez-Hernández and María José Grajal-Martín

The mango is an important fruit crop cultivated throughout the tropics and subtropics. Despite ranking fifth in total world fruit production ( FAO, 2010 ), its breeding potential has not been as well exploited as that of other major crops. Most of

Free access

Rosanna Freyre, Adam Moseley, Sandra B. Wilson, and Gary W. Knox

plant damage and control is estimated at nearly $35 billion a year and plant invasions are increasing at a rate of 10% annually ( Pimentel et al., 2005 ). Conventional and new biotechnologies such as use of wide hybridization, selection and breeding for

Full access

Shuang Jiang, Haishan An, Xiaoqing Wang, Chunhui Shi, Jun Luo, and Yuanwen Teng

pear. Pear breeding is based on intraspecific and interspecific hybridization and has traditionally relied on the evaluation of morphological characteristics, mainly fruit weight, sugar content, and taste. Recently, with the development of molecular

Free access

Geunhwa Jung

Dictionary of Plant Breeding, Second Edition . Rolf H.J. Schlegel. 2009. CRC Press, Boca Raton, FL. 584 pages. Hardback. Dr. Rolf H. J. Schlegel has published the Dictionary of Plant Breeding (2nd ed.) with the most up-to-date terms

Free access

David W. Davis and Karl J. Sauter

Attention has been given in recent literature to crop breeding for heat tolerance, but, as with certain other physiological traits, such as photosynthetic efficiency, practical gain has lagged. The question remains as to whether heat tolerance can be improved, and, if so, if it can most efficiently be improved by a holistic approach, as in breeding for yield following timely high temperature levels in the field environment, or whether the breeding for heat (and drought) tolerance components in the laboratory would be feasible. At issue is the identification and repeatability of key plant responses, such as cell membrane damage, heat shock protein formation, increased ethylene output and other responses, and the relevance, effectiveness and cost of screening for such traits. Results from our laboratory, and the work of others, will be reviewed.

Free access

David W. Davis and Karl J. Sauter

Attention has been given in recent literature to crop breeding for heat tolerance, but, as with certain other physiological traits, such as photosynthetic efficiency, practical gain has lagged. The question remains as to whether heat tolerance can be improved, and, if so, if it can most efficiently be improved by a holistic approach, as in breeding for yield following timely high temperature levels in the field environment, or whether the breeding for heat (and drought) tolerance components in the laboratory would be feasible. At issue is the identification and repeatability of key plant responses, such as cell membrane damage, heat shock protein formation, increased ethylene output and other responses, and the relevance, effectiveness and cost of screening for such traits. Results from our laboratory, and the work of others, will be reviewed.

Free access

Paul G. Thompson, Boyett Graves, and John C. Schneider

A breeding program to develop improved sweetpotato genotypes with increased sweetpotato weevil resistance was started in 1990. Germplasm, including plant introductions, cultivars, and breeding lines with reported insect resistance, was field tested for injury levels by applying low numbers of weevils. Low levels of resistance were found and `Regal' was among the highest. Top performing lines were selected and intermated. After 2 selection cycles the most highly resistant selection produced 89% uninjured roots compared to 28% in `Regal'. Severity of injury score was 16 times lower in the most resistant selection (0.15) compared to `Regal' (2.40).

Full access

John R. Stommel

breeding for parthenocarpy has demonstrated the utility of seedlessness for improved yield and quality in selected environments. Parthenocarpic pepper ( Honda et al., 2012 ; Tiwari et al., 2007 ), papaya ( Carica papaya ) ( Rimberia et al., 2007 ), summer

Open access

Dennis N. Katuuramu, W. Patrick Wechter, Marcellus L. Washington, Matthew Horry, Matthew A. Cutulle, Robert L. Jarret, and Amnon Levi

. lanatus as a result of repeated cycles of breeding, selection, and evolution ( Jarret et al., 2017 ; Levi et al., 2001 ). Breeding and improvement of C . lanatus in the past has historically been primarily focused on improving yield and fruit quality

Free access

Lori Hoagland, John Navazio, Jared Zystro, Ian Kaplan, Jose Gomez Vargas, and Kevin Gibson

their customers. Existing tomato cultivars may not be optimally adapted to organic production in the Midwest. There are currently no public fresh-market tomato breeding programs in this region and growers rely on cultivars developed in regions with