Effects of Pollen Quantity on Progeny Vigor: Evidence from the Desert Mustard Lesquerella fendleri

Evolution ◽  
1997 ◽  
Vol 51 (5) ◽  
pp. 1679 ◽  
Author(s):  
Randall J. Mitchell
Keyword(s):  
Lesquerella Fendleri ◽  
Pollen Quantity

scholarly journals Plant spacing and pollen quantity on yield and quality of squash seeds

2003 ◽  
Vol 21 (3) ◽  
pp. 443-447 ◽  
Author(s):  
Márcio S. de Lima ◽  
Antonio I. I. Cardoso ◽  
Marcelo F. Verdial
Keyword(s):  
Seed Yield ◽  
Seed Quality ◽  
Block Design ◽  
Fruit Production ◽  
Plant Spacing ◽  
Plant Seed ◽  
Yield And Quality ◽  
Randomized Complete Block Design ◽  
Pollen Quantity

Squash seeds yield and quality can be improved by proper population plant spacing and the pollen quantity, which influences the pollination quality and fertilization. Nine experiments were conducted as a factorial combination of three spacing between plants (0.8 x 0.3, 0.8 x 0.6 and 0.8 x 0.9 m), two quantities of pollen (50% of an anther and another entire one) and natural insect pollination. Seed and fruit production parameters, and seed quality were evaluated. A randomized complete block design, five replications, with ten plants per plot was adopted. Larger plant spacing increased the average number of mature fruits and seed yield per plant. Seed yield was directly proportional to the amount of pollen used during pollination. Higher amounts of pollen resulted in higher seed yield per area, but the plant spacing did not affect this characteristic. Manual pollination, using a whole anther, did not differ from natural pollination in relation to seed yield and quality.

Annual dormancy cycles in Lesquerella fendleri (Brassicaceae) seeds stored under both field and laboratory conditions

2000 ◽  
Vol 77 (11) ◽  
pp. 1648-1654
Author(s):  
Laura A Hyatt ◽  
Ann S Evans ◽  
Carol C Baskin
Keyword(s):  
Seed Storage ◽  
Storage Conditions ◽  
Perennial Species ◽  
Lesquerella Fendleri ◽  
Laboratory Conditions ◽  
Fluctuating Environments ◽  
Growth Chambers ◽  
Field And Laboratory Conditions ◽  
Dormancy Cycles ◽  
Over Time

Patterns of germination over time were investigated in a short-lived desert perennial species, Lesquerella fendleri (Gray) S. Wats. Field-collected seeds were either buried in the field in cloth bags or stored in a glass jar under laboratory conditions. Regular germination tests were conducted under a range of alternating temperatures (buried seeds) or under differing water regimes (laboratory-stored seeds). Testing revealed Lesquerella fendleri to have an annual dormancy-nondormancy cycle, which was manifest regardless of seed storage conditions, suggesting that cycles may be partially endogenously regulated. Increasing seed germinability in field-stored seeds (maximum of 30% in year 1 and 95% in year 2) leads to the formation of a seed bank for at least 1 year and enhances the possibility of spreading germination events through time. This allows parent plants to maximize fitness in randomly fluctuating environments. The existence of two seedling flushes in the field and single germinability peaks in growth chambers suggests that dormancy cycling may support the formation of a metapopulation with subpopulations which are, although physically intermingled, genetically distinct.

Effectiveness of Invertebrate and Vertebrate Pollinators and the Influence of Pollen Limitation and Inflorescence Position on Follicle Production of Banksia aemula (Family Proteaceae)

1999 ◽  
Vol 47 (4) ◽  
pp. 553 ◽  
Author(s):  
Elizabeth Dalgleish
Keyword(s):  
Pollen Limitation ◽  
New South ◽  
New South Wales ◽  
Follicle Development ◽  
South Wales ◽  
Pollen Quantity

Follicle development of Banksia aemula (R.Brown 1810) was studied in northern New South Wales, Australia, after exposure of inflorescences to different combinations of pollinator type and pollen quantity. When inflorescences within plants were exposed to all pollinators and provided with additional cross-pollen, follicle development was increased, suggesting that B. aemula was pollen-limited. The addition of cross-pollen did not increase follicle development when inflorescences within plants were exposed to invertebrate pollination only. Nor did exclusion of vertebrates significantly reduce follicle development of plants relative to that of others which were exposed to all pollinators. The vegetation surrounding plants influenced the follicle development of inflorescences, and inflorescences in peripheral positions had more follicles than inflorescences that were internal.

Lesquerella fendleri seed oil content and composition: harvest date and plant population effects

1996 ◽  
Vol 5 (3) ◽  
pp. 245-252 ◽  
Author(s):  
Kebe Brahim ◽  
David K. Stumpf ◽  
Dennis T. Ray ◽  
David A. Dierig
Keyword(s):  
Oil Content ◽  
Seed Oil ◽  
Plant Population ◽  
Harvest Date ◽  
Seed Oil Content ◽  
Lesquerella Fendleri ◽  
Population Effects
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