Pollen Limitation and Population Growth in a Herbaceous Perennial Legume

Ecology ◽  
1995 ◽  
Vol 76 (2) ◽  
pp. 652-656 ◽  
Author(s):  
Johan Ehrlen ◽  
Ove Eriksson
Keyword(s):  
Population Growth ◽  
Pollen Limitation ◽  
Perennial Legume ◽  
Herbaceous Perennial

Pre-dispersal seed predation by the weevils Trichapion rostrum and Tychius sordidus limits reproductive output of Baptisia alba (Fabaceae)

Botany ◽  
2017 ◽  
Vol 95 (8) ◽  
pp. 809-817 ◽  
Author(s):  
Ashley M. Hembrough ◽  
Victoria A. Borowicz
Keyword(s):  
Seed Production ◽  
Seed Predation ◽  
Reproductive Output ◽  
Pollen Limitation ◽  
Reproductive Potential ◽  
Prairie Restoration ◽  
Seed Number ◽  
Nutrient Supplementation ◽  
Perennial Legume ◽  
Herbaceous Perennial

Baptisia alba (L.) Vent., an herbaceous, perennial legume, produces more flowers than will mature into pods. Single-year experiments on two reconstructed prairies tested the hypothesis that reproductive potential of B. alba depends on nutrients, but pollen limitation and pre-dispersal seed predation by weevils reduce final production. Ramets were assigned one of four treatments that were combinations of fertilizer (none/70 g fertilizer twice) and insect barrier (none/application of Tanglefoot). Within inflorescences, flowers were naturally pollinated or supplemented with pollen. Fertilizer produced no effects, suggesting that B. alba are unresponsive within a season to nutrient supplementation. Pollen supplementation increased pod initiation at the two sites by 6.7% and 2.3%, respectively, but did not affect the proportion of initiated pods that matured or seed number within pods. Where Tychius sordidus occurred, only 67 pods matured on 19 ramets and only four seeds survived. Where only Trichapion rostrum was present, insect barrier increased pod maturation almost three-fold, but did not affect seed number within pods. Barrier treatment increased the reproductive output of entire ramets by increasing seed production, from 3.6 seeds·ramet−1 to 60.5 seeds·ramet−1. Prairie restoration frequently uses fruit collected from other populations. Managers should be careful to avoid the unintended introduction of voracious seed predators.

scholarly journals Insights into the evolution of symbiosis gene copy number and distribution from a chromosome-scale Lotus japonicus Gifu genome sequence

DNA Research ◽  
2020 ◽  
Vol 27 (3) ◽  
Author(s):  
Nadia Kamal ◽  
Terry Mun ◽  
Dugald Reid ◽  
Jie-Shun Lin ◽  
Turgut Yigit Akyol ◽  
...  
Keyword(s):  
Genome Sequence ◽  
Reference Genome ◽  
Large Fraction ◽  
Lotus Japonicus ◽  
Gene Copy Number ◽  
Genetic Maps ◽  
Gene Copy ◽  
Expression Data ◽  
Perennial Legume ◽  
Herbaceous Perennial

Abstract Lotus japonicus is a herbaceous perennial legume that has been used extensively as a genetically tractable model system for deciphering the molecular genetics of symbiotic nitrogen fixation. Our aim is to improve the L. japonicus reference genome sequence, which has so far been based on Sanger and Illumina sequencing reads from the L. japonicus accession MG-20 and contained a large fraction of unanchored contigs. Here, we use long PacBio reads from L. japonicus Gifu combined with Hi-C data and new high-density genetic maps to generate a high-quality chromosome-scale reference genome assembly for L. japonicus. The assembly comprises 554 megabases of which 549 were assigned to six pseudomolecules that appear complete with telomeric repeats at their extremes and large centromeric regions with low gene density. The new L. japonicus Gifu reference genome and associated expression data represent valuable resources for legume functional and comparative genomics. Here, we provide a first example by showing that the symbiotic islands recently described in Medicago truncatula do not appear to be conserved in L. japonicus.

scholarly journals Characterization of Meloidogyne arenaria, M. javanica, and M. incognita reaction of the USA Arachis pintoi (Krapov. & W.C. Gregory) germplasm collection

2009 ◽  
Vol 36 (2) ◽  
pp. 121-125 ◽  
Author(s):  
Marcelo Ayres Carvalho ◽  
Kenneth H. Quesenberry
Keyword(s):  
Germplasm Collection ◽  
Ground Cover ◽  
Meloidogyne Arenaria ◽  
Multiple Use ◽  
Arachis Pintoi ◽  
The Usa ◽  
National Plant Germplasm System ◽  
Perennial Legume ◽  
Herbaceous Perennial

Abstract Arachis pintoi Krapov. & W.C. Gregory is a herbaceous, perennial legume, exclusively native to Brazil. It is considered a multiple use legume, being grown for forage; ground cover in fruits orchards, forest, and low tillage systems; erosion control; and ornamental purposes. Accessions of the A. pintoi USA germplasm collection of the National Plant Germplasm System (NPGS) were evaluated to characterize its reaction to Meloidogyne arenaria (Neal) Chitwood, M. javanica (Treub) Chitwood, and M. incognita (Kofoid and White) Chitwood. Arachis pintoi germplasm presented great variability and high levels of resistance to M. arenaria, M. javanica, and M. incognita.

Pollen limitation and its effect on seed germination

2018 ◽  
Vol 28 (4) ◽  
pp. 253-260 ◽  
Author(s):  
Jerry M. Baskin ◽  
Carol C. Baskin
Keyword(s):  
Seed Germination ◽  
Population Growth ◽  
Seed Production ◽  
Seed Quality ◽  
Pollen Limitation ◽  
Growth Models ◽  
Germination Percentage ◽  
Positive Zero ◽  
Equal Weight ◽  
Population Growth Models

AbstractIn nature, fruit and seed production in many plants have been shown to be pollen limited. Pollen limitation is demonstrated when open-pollinated plants that are hand-supplemented (Ps) with outcross pollen produce more fruits and/or seeds than open-pollinated controls that are not hand-pollinated (Po). There are three categories of results in such studies: Ps> Po, Ps= Poand Ps< Po, in which case pollen limitation indices are positive, zero and negative, respectively. In an index widely used to calculate pollen limitation, 1 – (Po/Ps), the bounds for Ps≥ Poare 0 to + 1, whereas the bounds for Ps< Poare 0 to –∞. The first aim of this review was to show how the pollen limitation index can be modified so that the bounds of Ps< Poare 0 and –1, whereupon the index gives equal weight to the best performer (Psor Po) and worst performer (Psor Po). In addition to seed quantity, pollen supplementation can affect seed quality, including germinability. Thus, our second aim was to summarize the results of studies that have also tested the effect of pollen limitation on seed germination. In short, the 30 case studies in 15 families, 16 genera and 18 species that we identified show that seed germination percentage increased, was not affected or decreased by pollen supplementation in 12, 11 and seven cases, respectively. The effect of pollen limitation on seed germination, which can be quite large, has not been considered in developing population growth models to determine the effect of pollen limitation on λ.

Future applications of lucerne for efficient livestock production in southern Australia

2012 ◽  
Vol 63 (9) ◽  
pp. 909 ◽  
Author(s):  
A. W. Humphries
Keyword(s):  
Plant Traits ◽  
Growing Season ◽  
Livestock Production ◽  
Future Trends ◽  
Fodder Crop ◽  
Breeding Objectives ◽  
Dairy Systems ◽  
Perennial Legume ◽  
Herbaceous Perennial ◽  
Careful Management

Lucerne is a deep-rooted herbaceous perennial legume with high levels of summer production and adaptation to a broad range of agro-ecological environments in southern Australia. The ability of lucerne to extend the growing season of winter-based pasture and respond quickly to rainfall after periods of drought makes it one of the most valuable plants in our feed base. However, for all the advantages of lucerne, it remains underutilised. Lucerne is often considered to be a speciality fodder crop, requiring careful management to achieve high levels of production and persistence. This paper investigates the opportunity of whole-farm integration of lucerne; from speciality fodder crop to traditional pasture. The future trends of lucerne production in temperate grazing and intensive dairy systems are discussed in relation to breeding objectives identified to meet these demands. If lucerne is to be used more commonly as a pasture, the plant and systems must adapt. This paper investigates the plant traits and management principles that are important for growing lucerne in mixtures with other plants and improving the integration of lucerne into the whole-farm plan.

Does pollen limitation affect population growth of the endangered Dracocephalum austriacum L.?

2014 ◽  
Vol 57 (1) ◽  
pp. 105-116 ◽  
Author(s):  
Sílvia Castro ◽  
Tomáš Dostálek ◽  
Sascha van der Meer ◽  
Gerard Oostermeijer ◽  
Zuzana Münzbergová
Keyword(s):  
Population Growth ◽  
Pollen Limitation

scholarly journals Insights into the evolution of symbiosis gene copy number and distribution from a chromosome-scale Lotus japonicus Gifu genome sequence

2020 ◽  
Author(s):  
Nadia Kamal ◽  
Terry Mun ◽  
Dugald Reid ◽  
Jie-shun Lin ◽  
Turgut Yigit Akyol ◽  
...  
Keyword(s):  
Genome Sequence ◽  
Reference Genome ◽  
Large Fraction ◽  
Lotus Japonicus ◽  
Gene Copy Number ◽  
Genetic Maps ◽  
Gene Copy ◽  
Expression Data ◽  
Perennial Legume ◽  
Herbaceous Perennial

AbstractAimLotus japonicus is a herbaceous perennial legume that has been used extensively as a genetically tractable model system for deciphering the molecular genetics of symbiotic nitrogen fixation. Our aim is to improve the L. japonicus reference genome sequence, which has so far been based on Sanger and Illumina sequencing reads from the L. japonicus accession MG-20 and contained a large fraction of unanchored contigs.Methods and ResultsHere, we use long PacBio reads from L. japonicus Gifu combined with Hi-C data and new high-density genetic maps to generate a high-quality chromosome-scale reference genome assembly for L. japonicus. The assembly comprises 554 megabases of which 549 were assigned to six pseudomolecules that appear complete with telomeric repeats at their extremes and large centromeric regions with low gene density.Conclusion and PerspectivesThe new L. japonicus Gifu reference genome and associated expression data represent valuable resources for legume functional and comparative genomics. Here, we provide a first example by showing that the symbiotic islands recently described in Medicago truncatula do not appear to be conserved in L. japonicus.

Sign in / Sign up

Export Citation Format

Share Document