scholarly journals Cone and seed characteristics of Juniperus excelsa (M. bieb) in Balochistan province, Pakistan

2022 ◽  
Vol 11 (3) ◽  
Author(s):  
Muhammad Waseem Khan
Keyword(s):  
Juniperus Excelsa ◽  
Seed Characteristics

scholarly journals Comparative Study on Seed Characteristics, Antioxidant Activity, and Total Phenolic and Flavonoid Contents in Accessions of Sorghum bicolor (L.) Moench

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3964
Author(s):  
Bimal-Kumar Ghimire ◽  
Ji-Won Seo ◽  
Chang-Yeon Yu ◽  
Seung-Hyun Kim ◽  
Ill-Min Chung
Keyword(s):  
Antioxidant Activity ◽  
Agronomic Traits ◽  
Germination Rate ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Extensive Study ◽  
Total Phenolic ◽  
Phytochemical Content ◽  
Seed Characteristics ◽  
Seed Extracts

Sorghum is a major cereal food worldwide, and is considered a potential source of minerals and bioactive compounds. Its wide adaptive range may cause variations in its agronomic traits, antioxidant properties, and phytochemical content. This extensive study investigated variations in seed characteristics, antioxidant properties, and total phenolic (TPC) and flavonoid contents (TFC) of sorghum collected from different ecological regions of 15 countries. The antioxidant potential of the seed extracts of various sorghum accessions was determined using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2′-azinobis 3-ethylbenzothiazoline-6-sulfonate (ABTS) radical scavenging assays. Significant variations in TPC were observed among the sorghum accessions. All 78 sorghum accessions used in this study exhibited significant variations in TFC, with the lowest and highest amount observed in accessions C465 and J542, respectively. DPPH scavenging potential of the seed extracts for all the accessions ranged from 11.91 ± 4.83 to 1343.90 ± 81.02 µg mL−1. The ABTS assay results were similar to those of DPPH but showed some differences in the accessions. Pearson’s correlation analysis revealed a wide variation range in the correlation between antioxidant activity and TPC, as well as TFC, among the sorghum accessions. A wide diversity range was also recorded for the seed characteristics (1000-seed weight and seed germination rate). A dendrogram generated from UPGMA clustering, based on seed traits, antioxidant activity, TPC, and TFC was highly dispersed for these accessions. Variations among the accessions may provide useful information regarding the phytoconstituents, antioxidant properties, and phytochemical contents of sorghum and aid in designing breeding programs to obtain sorghum with improved agronomic traits and bioactive properties.

scholarly journals Assessing the storage potential of Australian rainforest seeds: a decision-making key to aid rapid conservation

2021 ◽  
Author(s):  
K. D. Sommerville ◽  
G. Errington ◽  
Z-J. Newby ◽  
G. S. Liyanage ◽  
C. A. Offord
Keyword(s):  
Decision Making ◽  
Logistic Regression ◽  
Dry Weight ◽  
Germination Percentage ◽  
Fleshy Fruit ◽  
Seed Moisture Content ◽  
Fresh Seed ◽  
Desiccation Sensitivity ◽  
Seed Moisture ◽  
Seed Characteristics

AbstractSeed banking of rainforest species is hindered by lack of knowledge as to which species are tolerant of desiccation and freezing. We assessed 313 Australian rainforest species for seed banking suitability by comparing the germination percentage of fresh seeds to seeds dried at 15% RH and seeds stored at −20 °C after drying. We then compared desiccation responses to environmental, habit, fruit and seed characteristics to identify the most useful predictors of desiccation sensitivity. Of 162 species with ≥ 50% initial germination, 22% were sensitive to desiccation, 64% were tolerant and 10% were partially tolerant; the responses of 4% were uncertain. Of 107 desiccation tolerant species tested for response to freezing, 24% were freezing sensitive or short-lived in storage at −20 °C. Median values for fresh seed moisture content (SMC), oven dry weight (DW) and the likelihood of desiccation sensitivity (PD-S) were significantly greater for desiccation sensitive than desiccation tolerant seeds. Ninety-four to 97% of seeds with SMC < 29%, DW < 20 mg or PD-S < 0.01 were desiccation tolerant. Ordinal logistic regression of desiccation response against environmental, habit, fruit and seed characteristics indicated that the likelihood of desiccation sensitivity was significantly increased by a tree habit, fleshy fruit, increasing fresh SMC and increasing PD-S. The responses observed in this study were combined with earlier studies to develop a simple decision key to aid prediction of desiccation responses in untested rainforest species.

scholarly journals Short-term study on the yak dung seed bank on the Qinghai-Tibetan Plateau: effects of grazing season, seed characteristics and forage preferences

2021 ◽  
Author(s):  
Shulin Wang ◽  
Fujiang Hou
Keyword(s):  
Tibetan Plateau ◽  
Plant Species ◽  
Seed Bank ◽  
Seedling Density ◽  
Seed Shape ◽  
Grazing Season ◽  
Size And Shape ◽  
Foraging Preferences ◽  
Seed Characteristics ◽  
Yak Dung

Abstract Aims Viable seeds in herbivore dung constitute the dung seed bank, and the contribution of livestock dung to this seed bank in grazing pastures is often overlooked. Grazing season (warm and cold), seed characteristics (size and shape), and forage preference are the main factors that affect the size and composition of the dung seed bank and ultimately affect grassland ecology. However, how these three factors interact is unclear. Methods We collected yak dung as well as seeds of the common plant species from warm- and cold-season alpine meadows in northeastern Qinghai-Tibetan Plateau, and explored how grazing season (warm and cold), seed characteristics (size and shape) and foraging preferences (temporary cages method) affects yak dung seedling density, richness and diversity in an alpine pasture. Results Forty-three plant species (mainly perennials) germinated from yak dung. Dung seedling density, richness, and diversity did not differ significantly between the two grazing seasons. Small to medium-sized spherical seeds (seed size < 10 mg, shape index < 0.5) had the greatest germination potential. Conclusions Yaks vary their forage preference depending on the season (phenological period), and endozoochory occurs throughout both grazing seasons. Seed shape and size directly regulate the dung seedling density, richness, and diversity. Dung seedlings increase the heterogeneity of the aboveground vegetation near the microsites of the dung pieces and therefore promote grassland patching. Our study demonstrates that grazing season, seed characteristics, and yak forage preferences affect the dung seed bank in grazing ecosystems.

Early genetic differentiation of sugar maple by accelerating seedling growth

1981 ◽  
Vol 11 (2) ◽  
pp. 288-291
Author(s):  
Bruce W. Wood ◽  
James W. Hanover
Keyword(s):  
Sugar Maple ◽  
Field Observations ◽  
Production Methods ◽  
Considerable Potential ◽  
Nursery Production ◽  
Lower Peninsula ◽  
Accelerated Growth ◽  
Outdoor Nursery ◽  
Time Required ◽  
Seed Characteristics

A method is described for accelerating growth of sugar maple (Acersaccharum Marsh.) seedlings for early progeny and provenance evaluation and plantation establishment. Outdoor nursery production methods produced relatively small seedlings, few seed-lot differences, and no provenance differences in seedlings 4 and 16 months of age. In contrast, accelerated seedlings exhibited pronounced seed-lot and provenance differences at both ages and had a 29 and 80% height superiority at 4 and 16 months, respectively. Provenance differences in height, budbreak, nodes, and growth flushes revealed by the accelerated treatment and supplemented by seed characteristics indicate existence of Upper and Lower Peninsula races in Michigan. Accelerated growth techniques may have considerable potential for reducing the time required for genotypic evaluation of sugar maple and possibly other tree species, but results must be substantiated by subsequent field observations.

scholarly journals Eriophyoid Mite of the Genus <i>Trisetacus</i> Reported on <i>Juniperus excelsa</i> in Lebanon

2013 ◽  
Vol 04 (02) ◽  
pp. 395-399 ◽  
Author(s):  
Bouchra Douaihy ◽  
Philipp E. Chetverikov ◽  
Nathalie Machon ◽  
Magda Bou Dagher-Kharrat
Keyword(s):  
Juniperus Excelsa ◽  
Eriophyoid Mite

Taiwanese montaneSambucus chinensisseeds require warm stratification, contrasting with other congeneric temperate members

2014 ◽  
Vol 24 (3) ◽  
pp. 217-228 ◽  
Author(s):  
Shun-Ying Chen ◽  
Ching-Te Chien ◽  
Siti N. Hidayati ◽  
Jeffrey L. Walck
Keyword(s):  
North America ◽  
Cold Stratification ◽  
Cold Temperatures ◽  
Tropical Regions ◽  
Morphophysiological Dormancy ◽  
Primary Mechanism ◽  
Northern Latitudes ◽  
Northern Hemispheric ◽  
Response To Temperature ◽  
Seed Characteristics

AbstractMany temperate plant genera, likeSambucus, have species with range disjunctions among North America, Europe and/or Asia. Cold stratification (sometimes in combination with warm stratification) is the primary mechanism to break seed dormancy in these species. For some of these genera showing Northern Hemispheric disjunctions, members also occur in subtropical or tropical regions, mostly confined to higher elevations where climate and vegetation differ from those in northern latitudes. We made two hypotheses concerning germination for the subtropical TaiwaneseSambucus chinensis: (1) seeds from populations exposed to warm temperatures would require warm stratification, and (2) seeds from populations exposed to cold temperatures need cold stratification. We investigated the germination (including embryo growth) of non-stratified seeds over a range of temperatures and tested the effects of cold stratification and of gibberellins GA3and GA4on germination. The amount and timing of germination among populations varied substantially in response to temperature treatments. Seeds from all populations of this species required warm temperatures for dormancy break and germination, regardless of environmental conditions. As such, the majority of seeds had non-deep simple morphophysiological dormancy, which, until now, has not been reported in any members ofSambucus. The seed characteristics of the subtropicalS. chinensisare different from those of temperate members of the genus in which cold stratification is the predominate treatment to overcome dormancy.

Sign in / Sign up

Export Citation Format

Share Document