Search Results

You are looking at 1 - 10 of 1,423 items for :

Clear All
Free access

R.L. Sayers

91 WORKSHOP 8 (Abstr. 1042-1045) Seed Vigor Testing and Utilization

Free access

Aleta L Meyr

91 WORKSHOP 8 (Abstr. 1042-1045) Seed Vigor Testing and Utilization

Free access

Gunching Siriwitayawan, A. Bruce Downie and Robert L. Geneve

Sweet corn (Zea mays L.) and tomato (Lycopersicon esculentum Mill.) seeds were aged naturally for 18 months or artificially aged using saturated salt accelerated aging to provide seed lots that differed in seed vigor, but retained a high standard germination percentage. Seed vigor was confirmed using standard vigor tests, including time to radicle emergence, cold, and accelerated aging tests. Ethylene evolution from both sweet corn and tomato seeds during germination was positively correlated with seed quality. Differences in ethylene evolution between nonaged and aged seeds were greater in seeds germinated on exogenous 1-aminocyclopropane-1-carboxylic acid (ACC). After 36 hours, there was about a 15-fold increase in ethylene evolution from seeds treated with 5 mm ACC compared to untreated seeds. Naturally and artificially aged seeds responded similarly and showed reduced ethylene production compared to nonaged seeds. In contrast to ethylene production, endogenous ACC titers were less for nonaged compared to aged seeds. Exogenous application of ACC to artificially aged seeds reduced the time to radicle protrusion, but did not completely reverse age-related effects on vigor. The data indicate that the reduced ability to produce ethylene in aged seeds was related to ACC oxidase (ACCO) synthesis or activity. Using Northern blot analysis, ACCO mRNA was detected after 48 hours of imbibition in nonaged seeds, but was undetectable in aged seeds affirming the contention that ACCO synthesis was delayed or reduced by aging. The current study provides additional support for ethylene as a biochemical indicator of seed vigor in seed lots with reduced vigor but high germination capacity.

Free access

Robert Conrad

91 WORKSHOP 8 (Abstr. 1042-1045) Seed Vigor Testing and Utilization

Free access

Steven C. Adams

91 WORKSHOP 8 (Abstr. 1042-1045) Seed Vigor Testing and Utilization

Free access

Lorenzo León, Raúl de la Rosa, Diego Barranco and Luis Rallo

bearing, vigor, crop, and yield efficiency in the 4 years after planting, from 2001 to 2005. Height and trunk diameter prior the beginning of each growing season were recorded. In the last year (Feb. 2005), canopy height and width (measured east–west and

Free access

Burcu Begüm Kenanoglu, Ibrahim Demir and Henk Jalink

result of pre-storage and post-storage factors ( Powell et al., 1984 ). Improving the seedling emergence potential (emergence percentages and uniformity) of a seed lot is important for crops that are produced from transplants such as pepper. Vigor may be

Full access

Stephen J. Stringer, Donna A. Marshall, Blair J. Sampson and James M. Spiers

characteristics The study location was in a warm temperate humid climate (lat. 30°49′48″N, long. 89°30′W) ≈80 km inland from the Gulf of Mexico, where winter temperatures are seldom sufficiently low to cause freeze damage and vigor reduction to trunks and cordons

Free access

Gerry H. Neilsen, Denise Neilsen, Frank Kappel, Peter Toivonen and Linda Herbert

., 2004 ). Surface mulches have been advocated in the initial years of high-density apple orchards as a method of improving soil quality and tree vigor and yield ( Neilsen et al., 2003 ). Recently, the advantages of multiple, small, daily nutrient and

Full access

Bizhen Hu, Mark A. Bennett and Matthew D. Kleinhenz

Seed and seedling vigor influence horticultural operations significantly and much has been done to establish operational definitions of and methods to assess both. For many, the line between seed vigor and seedling vigor is the transition of new