Germination Studies of Clay-coated Sweet Pepper Seeds1

A laboratory experiment was conducted to determine the effect of the hydrophilic polymer Waterlock B100 on the imbibition, respiration, and germination of seeds of the sweet corn (Zea mays L. var. saccharum) hybrid ‘Mevak’ at soil water matric potentials of -0.01, -0.40, -1.0, and - 1.5 MPa. Coated seeds had a higher final percentage of imbibition, higher rates of respiration, and germination at -0.01 and -0.40 MPa than uncoated seeds, but as the water potential decreased, the seed coating had a deleterious effect on the physiological processes leading to germination.

Section: Discussionmentioning

confidence: 99%

Effect of a Hydrophilic Polymer Seed Coating on the Imbibition, Respiration, and Germination of Sweet Corn at Four Matric Potentials

Baxter

Waters

1986

“…The procedures used in experiments where high 0 2 environ ment was tested were similar to those previously described (11). To increase 0 2 levels in the microenvironment of the germinating seed, barium peroxide (B a02) or sodium perborate (NaB03) were incorporated into the outer layers of the pellets during the sand-coating procedure.…”

Section: Methodsmentioning

confidence: 99%

“…Samples of sand-and clay-coated seeds were examined with a Hitachi S 450 scanning electron microscope. The preparation and viewing of specimens were the same as previously described (11). Osmotic values for the germination medium (the seed and coating materials leachate) were recorded using a vapor pressure osmometer (Wescon, Inc. Model 5130B).…”

Section: Methodsmentioning

confidence: 99%

“…Bell type pepper seeds lose their ability to germinate properly when coated with clay. However, this inhibition was overcome by germinating the seeds in a high 0 2 environment (11). In the present study, we used a relatively large particle size coating material (sand) in an attempt to alleviate the 0 2 restriction phe nomenon and to improve the germination rate of coated Bell pepper seed.…”

mentioning

confidence: 99%

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Germination Behavior of Sand-coated Sweet Pepper Seed1

Sachs

Cantliffe

Nell

1982

Self Cite

Germination rate of sand-coated pepper (Capsicum annum L.) seed (sand grain size < 75μm for an inner coat and 75–105 μm for an outer coat layer) was faster than clay-coated seed but was slower than raw seed. Part of the germination reduction in sand-coated seeds was caused by the water-soluble Gelvatol binder used. High oxygen (O2) levels promoted the germination of sand-coated seed to a rate comparable to that of raw seed. This suggests that even with a porous sand-coating material, O2 may be limiting for the germinating seed. When inorganic O2-releasing compounds (BaO2 or NaBO3) were incorporated into the sand material, the germination of pepper seed was further inhibited.

“…Increased germination and germination rate of several species has been achieved by increasing the 0 2 concentration (4,6). Sachs et al (11) found that clay-coated pepper seeds germinated faster in an environment of 100% 0 2. They suggested that the clay coating limited 0 2 supply to the embryo and thus inhibited germination at 0 2 concentrations of 21%.…”

mentioning

confidence: 99%

Temperature and Gibberellin-induced Respiratory Changes in Capsicum annuum during Germination at Varying Oxygen Concentrations

Watkins

Cantliffe

Sachs

1983

Self Cite

Concentrations of O2 greater than 21% stimulated germination rate of Capsicum annuum L. (sweet pepper) at 25°C but inhibited germination rate at 15°. At a 10% O2 concentration, germination rates were reduced at both temperatures. Gibberellins A4A7 (GA4+7) increased germination rates at 15° and 25° in air. At 25° in 100% O2, germination rates of GA-treated and nontreated seeds were the same. At 15° and 100% O2, germination rates were increased slightly by GA4+7 application; however, the rates were slower than in air. Total respiratory activity at 25° was higher in 100% O2 than in air. High O2 concentrations did not affect the proportion of respiration which was in the cyanide-sensitive and -resistant pathways. Cyanide-resistant respiration comprised only a small percentage of total respiratory activity. At 15°, total respiration and the cyanide-sensitive and -resistant components were similar regardless of O2 treatment. The addition of GA increased respiratory activity only after radicle emergence occurred. Thus, germination rate of pepper seed can be increased by increasing temperature, higher O2 concentrations at the higher temperature, and GA4+7 at normal and low temperatures. GA appears to affect germination through metabolic events which occur before radicle emergence and which do not include alteration of respiratory activity.