scholarly journals Floral habits and seed production characteristics in Egusi melon (Colocynthis citrullus L.)

2013 ◽  
Vol 4 (6) ◽  
pp. 137-140 ◽  
Author(s):  
Ogbonna Ogbonna
Keyword(s):  
Seed Production ◽  
Colocynthis Citrullus ◽  
Production Characteristics

Seed Production Characteristics of Three Fine Fescue Species in Residue Management Systems

2011 ◽  
Vol 103 (5) ◽  
pp. 1495-1502 ◽  
Author(s):  
Thomas G. Chastain ◽  
Carol J. Garbacik ◽  
Thomas B. Silberstein ◽  
William C. Young
Keyword(s):  
Seed Production ◽  
Residue Management ◽  
Management Systems ◽  
Fine Fescue ◽  
Production Characteristics

Effects of Two Diverse Environments on Seed Production Characteristics of Tall Fescue Hybrid Derivatives 1

Crop Science ◽  
1972 ◽  
Vol 12 (3) ◽  
pp. 264-268 ◽  
Author(s):  
R. C. Buckner ◽  
C. M. Rincker ◽  
P. B. Burrus ◽  
R. M. Cressman ◽  
C. S. Garrison
Keyword(s):  
Seed Production ◽  
Tall Fescue ◽  
Production Characteristics

scholarly journals Genetic divergence among interspecific Paspalum hybrids based on seed production traits

2017 ◽  
Vol 41 (4) ◽  
pp. 390-401
Author(s):  
Rodrigo Ramos Lopes ◽  
Lucia Brandão Franke ◽  
Cléber Henrique Lopes de Souza ◽  
Patrícia Bertoncelli ◽  
Larissa Arnhold Graminho
Keyword(s):  
Seed Production ◽  
Genetic Divergence ◽  
Block Design ◽  
Optimization Methods ◽  
Production Traits ◽  
Randomized Block Design ◽  
Heterosis Effect ◽  
High Concordance ◽  
Selection Of ◽  
Production Characteristics

ABSTRACT The use of genetic divergence as a basis for identifying superior individuals, with greater heterozygosity, is important in view of the difficulty when selecting of dissimilar genotypes exhibiting high average for interest traits. The aim of this study was to evaluate the genetic divergence and the expression of seed production traits in seventeen apomictic Paspalum plicatulum × Paspalum guenoarum hybrids and two male parents (P. guenoarum). A randomized block design was used, with genotypes individually arranged into ten blocks. The following traits were assessed: total number of tillers/plant (TT), reproductive tiller/plant (RT), number of racemes per inflorescence (NRI), reproductive tiller height (RTH), inflorescence rachis length (IRL), number of seeds/inflorescence (NSI), weight of a thousand seeds (WTS) and seed production (SP). Genetic divergence among the genotypes was estimated using the Tocher method and UPGMA clustering, based on the generalized Mahalanobis distance (D2 ii’). The Tocher and UPGMA optimization methods showed high concordance. The traits that most contributed to genetic divergence were RTH (23.59%), IRL (21.63%), WTS (16.67%) and SP (14.23%). The presence of genetic diversity made it possible to identify divergent genotypes and those with high means for the traits studied, allowing the selection of genotypes with significant breeding potential. Repeated cross-breeding of female superior plants with the genotypes Azulão and H20 can result in a high heterosis effect on seed production characteristics.

The effects of moisture supply and defoliation during flowering on seed production and hardseededness of Trifolium subterraneum L

1990 ◽  
Vol 30 (4) ◽  
pp. 515 ◽  
Author(s):  
KA Archer
Keyword(s):  
Seed Production ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Flowering Period ◽  
Viable Seed ◽  
Hard Seeds ◽  
Moisture Supply ◽  
Early Maturing ◽  
Seed Yields ◽  
Production Characteristics

The effect of length of the flowering period on seed production characteristics of 3 cultivars of subterranean clover (Trifolium subterraneum L.) was determined by varying the period of watering postflowering. The subterranean clover cvv. Nungarin, Seaton Park and Woogenellup were grown in polystyrene boxes and given 1 of 4 watering treatments: continuous (WC); until approximately 34 days after flowering commenced (WE); until Nungarin finished flowering (WN); as for WE but with watering recommenced after plants became wilted (WEL). Plants were either undefoliated or were repeatedly defoliated during flowering. Flowering in all 3 cultivars was terminated early and seed yields were reduced by WE (e.g. WC v. WE for Seaton Park, 1620 � 61 v. 320 � 61 kg/ha), but each of the cultivars was able to produce appreciable numbers of viable seed on the WE treatment, ranging from 406 � 95 seeds/dm2 for Woogenellup to 791 � 95 seeds/dm2 for Seaton Park. WEL increased seed size in all cultivars by approximately 50%, and increased seed numbers in Seaton Park to 1083 � 106 seeds/dm2. Nungarin produced most seeds on the WN treatment (1232 � 104 seeds/dm2), but approximately half of these were lost if the soil was kept moist during seed maturation. In comparison, little loss of seed was detected from Seaton Park and Woogenellup under continuous watering, possibly due to differences between cultivars ii seed dormancy and periods of exposure of maturing seeds to moisture. The development of initial hard seeds in Nungarin and undefoliated Seaton Park was adversely affected by continuous moisture. Repeated defoliation during flowering reduced seed yields in all cultivars (e.g. UD v. D for Seaton Park, 1130 � 44 v. 310 � 46 kg/ha), due to decreases in both seed numbers and size. The results indicate that choice of maturity of subterranean clover cultivars for areas with unreliable spring rainfall is not necessarily restricted to those early maturing cultivars which will always finish flowering prior to moisture restrictions.

Variability in habit, flowering and seed production within the Kangaroo Valley cultivar of Lolium perenne when grown in a range of environments

1990 ◽  
Vol 41 (5) ◽  
pp. 901 ◽  
Author(s):  
SG Shah ◽  
CJ Pearson ◽  
JW Read
Keyword(s):  
Seed Production ◽  
Seedling Emergence ◽  
Early Flowering ◽  
Population Characteristic ◽  
Seed Formation ◽  
Late Flowering ◽  
Seed Harvest ◽  
Different Populations ◽  
Seed Yields ◽  
Production Characteristics

Diversity of flowering and seed production characteristics were measured within and between seven populations of Kangaroo Valley perennial ryegrass. The hypothesis that these characteristics would not change when grown in diverse environments was tested. The average time from seedling emergence to spike emergence was similar for each of three biotypes that represented early, intermediate and late flowering populations. This occurred in spite of variation in this character of 54 to 72 days between plants within each of these biotypes. When data from all seven populations were combined, they formed a normal distribution with respect to time of flowering. Distinctive components of seed production were found for the different populations. Early flowering populations had higher seed yields and more but shorter spikes than late flowering populations. Wide variation in habit occurred within populations but there was a high correlation between erect habit and early flowering. Spikes of erect plants emerged 27 days earlier than prostrate plants. The seed formation characteristics of an early flowering population were unaltered when grown for three generations in diverse environments. The spike emergence and anthesis times for each of the seven populations were not changed when grown in new environments. We conclude that seed production of Kangaroo Valley ryegrass in environments similar to those described in these experiments will not significantly alter the population characteristic. For changes in the character of the population to occur, the new environment would have to be so severe to (a) restrict growth and select out a proportion of the progeny or (b) cause a change in the time of seed harvest.

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