Seed and Seedling Production of Blue Wild-Rye (Elymus glaucus)

Supplementary lighting is commonly used in high-quality seedling production. In this study, grafted tomato seedlings were grown for 10 days in a glasshouse with 16-h daily supplementary lighting at 100 μmol·m−2·s−1 PPFD (Photosynthetic photon flux density) from either high-pressure sodium (HPS), metal halide (MH), far-red (FR), white LEDs (Light emitting diodes) (W), or mixed LEDs (W1R2B1, where the subscript numbers indicate the ratio of the LED chips) to determine which light sources improve the seedling quality. The control seedlings did not receive any supplementary light. Physiological parameters and the expression of genes related to photosynthesis were analyzed. The results showed that root length, biomass, number of leaves, chlorophyll (SPAD), scion dry weight to height ratio (WHR), and specific leaf weight (SLW) were the greatest for grafted seedlings grown in W1R2B1. The level of root ball formation was the greatest for seedlings grown in W1R2B1, followed by those grown in W, HPS, and MH. Seedlings grown in FR did not fare well, as they were very thin and weak. Moreover, the expression of two photosynthetic genes (PsaA and PsbA) was significantly increased by W1R2B1 and W, which suggests that the plastid or nuclear genes might be regulated. The overall results suggest that W1R2B1 was the most suitable light source to enhance the quality of grafted tomato seedlings. The results of this study could be used as a reference for seedling production in glasshouses, and may provide new insights in the research on lights affecting the development of plants.

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Overcoming root dormancy and identifying the storage behaviour of Lilium polyphyllum seeds

Botany ◽

10.1139/cjb-2018-0161 ◽

2019 ◽

Vol 97 (2) ◽

pp. 161-166 ◽

Cited By ~ 1

Author(s):

Anurag Dhyani ◽

Carol C. Baskin ◽

Bhagwati Prasad Nautiyal ◽

Mohan Chandra Nautiyal

Keyword(s):

Room Temperature ◽

Seed Storage ◽

Seedling Production ◽

Spring Temperature ◽

Indole Butyric Acid ◽

Nitrogenous Compounds ◽

Morphophysiological Dormancy ◽

Mean Germination Time ◽

The Mean ◽

Endangered Medicinal Herb

Lilium polyphyllum D.Don ex Royle is a critically endangered medicinal herb of Himalaya. Seeds have epicotyl morphophysiological dormancy, and in the field a minimum of 34 weeks is required for root emergence. To date, treatments to decrease the time for root protrusion and seed storage behaviour have not been determined. We evaluated the effects of plant growth regulators and nitrogenous compounds as well as seed scarification on root emergence, and determined the storage behaviour of seeds. Root emergence at 20 °C was significantly increased by 100 ppm of indole butyric acid (IBA), KNO3, and thiourea, and by the application of NaOCl solution for 30 min. The mean germination time was significantly decreased by 50 ppm of gibberellic acid (GA3; 28 days) compared with 100 ppm GA3 (36 days). After 12 months of dry storage, the viability of seeds (TTC method) at room temperature (10–35 °C), 0–4 °C, and −20 ± 1 °C was 95%, 100%, and 100%, respectively; thus, the seeds have orthodox storage behaviour. Our recommendation for seedling production is to store the seeds at room temperature until they can be sown under warm wet conditions. Roots emerge after about 8 weeks, and then seeds should be given a 2-week cold moist treatment to break shoot dormancy. After 2 weeks of cold, transfer the seeds to warm (20 °C) spring temperature conditions to promote growth.

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ONION GENOTYPE SKILLS IN DIFFERENT PLANTING SYSTEMS

Revista Ciência Agrícola ◽

10.28998/rca.v17i2.5281 ◽

2019 ◽

Vol 17 (2) ◽

pp. 35

Author(s):

Gabriel Mascarenhas Maciel ◽

Guilherme Repeza Marquez ◽

Ariel Santivañez Aguilar ◽

Igor Forigo Beloti ◽

Igor Matheus Alves ◽

...

Keyword(s):

Rio Grande ◽

The State ◽

No Tillage ◽

Seedling Production ◽

Rio Grande Do Sul ◽

No Till ◽

Northwestern Region ◽

Agronomic Potential ◽

Planting System

Currently, planting onion through seedling production is predominant in the state of Rio Grande do Sul. Thus, the present work aimed to evaluate the agronomic potential of new onion genotypes as a function of the planting system for this region. Eleven genotypes were evaluated, as follows: “commercial genotypes” Bola Precoce, Mulata, Sprint, Suprema and “pre-commercial genotypes” TE 201, TE 209, TE 216, TE 230, TE 242, TE 316 and TE 329, submitted to four planting systems: seedling production, seedling production with leaf pruning before transplanting, no-tillage manually planted at the definitive site and seedling production in trays. Treatments were arranged in an 11 x 4 factorial scheme (eleven genotypes and four planting systems). Although little practiced, the no-till system for onion cultivation for the northwestern region of Rio Grande do Sul can potentially be explored. Genotypes that best adapted to this system were: Bola Precoce, Suprema, Sprint, Mulata and TE 201. Comparatively, “commercial” genotypes showed an increase of 10.81 t ha-1 in relation to “pre-commercial” genotypes in the no-till system, proving the efficiency of this system.

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Propagation of pariparoba (Piperaceae) by different types of stem cuttings and substrates

Acta Biológica Catarinense ◽

10.21726/abc.v6i3.531 ◽

2019 ◽

Vol 6 (3) ◽

pp. 75

Author(s):

Aurea Portes Ferriani ◽

Diones Krinski

Keyword(s):

Essential Oil ◽

Native Species ◽

Average Length ◽

Stem Cuttings ◽

Seedling Production ◽

Plant Propagation ◽

Significant Growth ◽

Different Types

Piper cernuum Vell., a native species known as pariparoba, presents essential oil with potential properties and significant growth in clearings, being indicated for the recovery of degraded areas. Prospecting studies for new botanical matrices need the development of specific essays of plant propagation for future domestication of the species. This work aimed to evaluate the rooting of different types of cuttings using different substrates to develop a seedling production protocol. Stem cuttings with one or two nodes were installed on three types of substrates (medium sifted sand, vermiculite of medium granulometry and commercial substrate [Tropstrato HP®]) and maintained in greenhouse for 60 days to evaluation of the percentages of survival, mortality, sprouts, rooting, average number and average length of the roots. The results showed interaction between cutting types and substrates for rooting percentage and sprouting cuttings. The largest rooting percentages were observed in apical cuttings planted in sand and vermiculite (57.0 and 55.25%, respectively). Cuttings with two nodes presented higher performance than those with one node when compared for the analyzed variables.

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PRODUÇÃO DE MUDAS DE PIMENTA PSEUDOCARYOPHYLLUS (GOMES) LANDRUM COM LODO DE ESGOTO Seedling production of Pimenta pseudocaryophyllus (Gomes) Landrum using sewage sludge

Revista Acadêmica Ciência Animal ◽

10.7213/academica.10.s01.ao07 ◽

2013 ◽

Vol 11 ◽

pp. 59

Author(s):

Maurício Bergamini Scheer ◽

Charles Carneiro ◽

Otávio Augusto Bressan ◽

Kaline Gomes dos Santos

Keyword(s):

Sewage Sludge ◽

Seedling Production

A necessidade de soluções sustentáveis para as questões ambientais impulsiona o aproveitamento do lodo gerado no tratamento de esgoto. Uma das opções é seu uso como insumo agrícola e florestal. Dessa forma, os objetivos deste trabalho foram avaliar o uso de lodo de esgoto aeróbio compostado com podas de árvores trituradas para a produção de mudas de Pimenta pseudocaryophyllus (craveiro-do-mato) com diferentes níveis de fertilização e comparar seu crescimento com o do substrato comercial de casca de Pinus compostada e vermiculita. Três níveis de fertilizante de liberação lenta foram testados (0; 2,7 e 4 g.dm-3) em três tipos de substratos: comercial; composto à base de lodo na proporção 3:1 (v:v); e composto à base de lodo na proporção 2:1 (v:v). Para avaliação foram mensuradas as variáveis: altura e diâmetro. O crescimento proporcionado às mudas com o uso dos compostos de lodo de esgoto foi superior ao substrato comercial em todos os níveis de fertilização, ficando ainda mais evidente se comparado ao nível sem adição de fertilizante. Apesar de os maiores valores obtidos (estatisticamente significativos para altura) terem sido observados com o uso do composto à base de lodo 3:1 com adição de 4 g.dm-3 de fertilizante, os obtidos com o uso do composto 2:1 com 2,7 g.dm-3 de fertilização foram capazes de proporcionar um crescimento 73% superior em diâmetro de colo e 66% superior em altura em relação às mudas produzidas com o substrato comercial com o mesmo nível de fertilização, e ainda, com o uso do substrato 2:1 com a dose de 1,9 g.dm-3, pode-se obter ganhos para a altura de 66 para 72% superiores, resultando em menor consumo de fertilizante mineral e uso de maior proporção de lodo de esgoto.

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