Development of Bean Rust Epidemics in a Field Planted with Alternate Rows of a Resistant and a Susceptible Snap Bean Cultivar

Calcium ions (Ca) play an important role in many biochemical processes, delaying senescence and controlling physiological disorders in fruits and vegetables. The objective of this experiment was to analyze the effect of increasing calcium concentrations in snap beans. Snap bean cultivar UEL 1 was sown in sand containing 80 mg L-1 of calcium supplemented with nutrient solution, plus calcium at different contents: 0, 75, 150 and 300 mg L-1. Ca was mainly recovered in the shoots, followed by roots and pods. Calcium concentrations in the pods were 130, 259, 349 and 515 mg 100 g-1dry matter on a dry weight basis, in relation to the enhancement of calcium contents in the nutrient solution, respectively. A negative relationship between nitrogen content in the pods and calcium concentration in the nutrient solution was observed. Pods from plants grown in a solution without Ca presented necrosis in their apical region. Dieback of roots, shoots and young leaves also occurred under low calcium supply. Dry matter of pods, roots and shoots, number of pods per plant, pod weight and pod length increased proportionally to calcium concentration in solution. Increasing rates of calcium improved biomass production in snap bean cultivar UEL 1.

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Snap Bean Variety Trials in East-Central Puerto Rico

The Journal of Agriculture of the University of Puerto Rico ◽

10.46429/jaupr.v46i3.12337 ◽

1969 ◽

Vol 46 (3) ◽

pp. 213-218

Author(s):

Oscar D. Ramírez ◽

J. Vélez-Santiago

Keyword(s):

Puerto Rico ◽

High Resistance ◽

Bean Rust ◽

Green Beans ◽

Snap Bean ◽

East Central ◽

Variety Trials ◽

Bean Variety ◽

Blue Lake ◽

Very High

Two snap bean variety trials were planted at the Gurabo Substation farm in east-central Puerto Rico. In the first trial five pole-bean varieties were tested. The varieties used were: Florigreen, Blue Lake 92, Blue Lake 228, Blue Lake 231, and Kentucky 191. Of these varieties Florigreen had the highest yield with a production of 4.30 tons of green beans per acre. It also showed high resistance to bean rust and mosaic, two of the worst diseases of beans. In the second trial eight lines and two commercial bush varieties were tested. They are B2971-1-1, B3370, B3095-3, B3489, B3365, B3125 x 5-2, B2567-1, B3076, Wade, and Top Crop. In this trial line B2971-1-1 produced the best yield with a production of 4.05 tons of green beans per acre, which is very high for bush beans in Puerto Rico.

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Changes in Sugar Concentrations of Seed and Pod Tissue During Development in Snap and Dry Beans (Phaseolus vulgaris L.)

HortScience ◽

10.21273/hortsci15261-20 ◽

2020 ◽

Vol 55 (10) ◽

pp. 1692-1697

Author(s):

Wesley Gartner ◽

Paul C. Bethke ◽

Theodore J. Kisha ◽

James Nienhuis

Keyword(s):

Phaseolus Vulgaris ◽

High Performance ◽

Sucrose Concentration ◽

Seed Mass ◽

Sugar Accumulation ◽

Dry Bean ◽

Snap Bean ◽

Bean Cultivar ◽

Snap Beans ◽

Rate Of Increase

Sugars, including glucose, fructose, and sucrose, contribute significantly to the flavor and consumer acceptance of snap beans (Phaseolus vulgaris L.). Sugar accumulation and changes in sugar profiles during snap bean development contribute to overall assessments of quality for breeding lines and cultivars. Developing fruit from a diverse group of four snap bean cultivars containing Andean germplasm and one Mesoamerican dry bean cultivar were sampled at 5-day intervals from 10 to 30 days after flowering over 2 years. Glucose, fructose, and sucrose in pod and seed tissue was quantified using high-performance liquid chromatography. Percent seed mass relative to pod mass increased with days after flowering, but the rate of increase was heterogeneous among cultivars. Significant differences in sugar accumulation patterns of mono- and disaccharides were observed with time of development and between pods and seeds. Glucose and fructose decreased rapidly in pods and seeds with time after flowering. In contrast, sucrose concentration increased in pod tissue but remained constant in seeds of the snap bean cultivars with time after flowering. The patterns of changes in pod and seed sugar concentrations with time after flowering were similar among all snap bean cultivars. In contrast to the snap beans, seed sucrose increased with time after flowering in the Mesoamerican dry bean cultivar Puebla 152. No year by day after flowering interactions were observed for sugar accumulation patterns or sugar concentrations. Younger snap beans had the highest sweetness index based on observed sugar concentrations, percent seed mass, and perception of relative sweetness by the human palate. Although mean sweetness varied between cultivars, the rate of decrease in sweetness with time was the same for all five cultivars. These findings indicate that variation for sweetness exists in snap beans and can be exploited by breeding to develop cultivars with a potentially more desirable, sweet flavor.

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Patterns of Fructose, Glucose, and Sucrose Accumulation in Snap and Dry Bean (Phaseolus vulgaris) Pods

HortScience ◽

10.21273/hortsci.47.7.874 ◽

2012 ◽

Vol 47 (7) ◽

pp. 874-878 ◽

Cited By ~ 7

Author(s):

Kyle M. VandenLangenberg ◽

Paul C. Bethke ◽

James Nienhuis

Keyword(s):

Phaseolus Vulgaris ◽

Sugar Content ◽

Soluble Sugar ◽

Sugar Concentration ◽

Sugar Accumulation ◽

Glucose Content ◽

Dry Bean ◽

Snap Bean ◽

Bean Cultivar ◽

Snap Beans

Sugars, including fructose, glucose, and sucrose, contribute significantly to the flavor and consumer acceptance of snap beans (Phaseolus vulgaris L.). Little is known regarding differences in sugar content among snap bean and dry bean cultivars and the patterns of sugar accumulation with increasing pod size. Alcohol–soluble sugar concentration of five snap bean cultivars and one dry bean cultivar planted in field trials was assayed throughout pod development over 2 years using high-performance liquid chromatography. Significant differences in sugar accumulation patterns and quantity were observed among cultivars. In general, fructose and glucose content decreased, whereas sucrose increased with increasing pod size in snap beans. In contrast, fructose and glucose amounts increased, whereas sucrose concentration remained unchanged with increasing pod size in the dry bean cultivar. No year-by-genotype interactions were observed for sugar accumulation patterns or sugar amount. Results indicate that sieve size No. 3 (7.34 to 8.33 mm) or No. 4 (8.33 to 9.52 mm) pods are suitable for detecting differences in sugar concentration among genotypes.

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