Leaf Phenology and Leaf Damage of Saplings in the Luquillo Experimental Forest, Puerto Rico1

Variation in herbivory is often associated with plant density and light environment. The effect of these variables was studied on leaf production and herbivory of Manilkara bidentata in Puerto Rico. The major herbivore of M. bidentata is the leaf miner Acrocercops sp. To determine the effect of plant density, twenty-four 20-m × 20-m plots were established and the densities of saplings, juveniles and adults were determined. Leaf production, herbivory and growth were measured on saplings. Plant density was determined in eight 20-m × 20-m plots surrounding the focal plots. The effect of light was determined by comparing leaf phenology, leaf quality and herbivory in vertical and horizontal profiles. Sapling density in 60-m × 60-m plots was associated with herbivory. In the vertical profile, leaf production was continuous only for the canopy: herbivory increased from the canopy (1.3%) towards the understorey (35.6%). In the horizontal profile leaf production was related to light. Saplings in low light environments had narrow peaks in leaf production compared with saplings in high light environments. Differences in leaf phenology did not result in differences in herbivory possibly because of variation in herbivory among leaves. Although many saplings lost more than 80% of new leaf area, there was no detectable effect on growth. High levels of intra-specific variation in herbivory suggest that to better understand plant/herbivore interactions it is necessary to consider all size classes in a population. It is also important to document these pattern across different spatial scales.

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SHIFTS IN LEAF PHENOLOGY OF THREE HIMALAYAN OAK SPECIES: ROLE OF WOOD WATER PROPERTIES

Ecoprint An International Journal of Ecology ◽

10.3126/eco.v24i0.20644 ◽

2017 ◽

Vol 24 ◽

pp. 29-36

Author(s):

Deepak B. Chand ◽

Kanta Poudyal ◽

P. K. Jha

Keyword(s):

Leaf Damage ◽

Leaf Phenology ◽

Monthly Variation ◽

Water Properties ◽

Leaf Emergence ◽

Quercus Glauca ◽

Quercus Semecarpifolia ◽

Evergreen Oak ◽

Tree Leaf

An investigation has been done with the three Himalayan oak species at Phulchowki Hill Lalitpur Nepal to relate leaf phenology responses of trees to wood water properties. We recorded the wood water content, wood density, water in wood and leaf phenological patterns of three evergreen oak species (Quercus semecarpifolia, Quercus lamellosa and Quercus glauca) for 2 years. Our results revealed significant changes in leaf phenology within oak species between years, with shifts in leaf emergence, leaf damage and leaf senescence. Shifts in tree leaf phenology found in studied years suggest that the inter-annual and monthly variation in wood water properties could attribute to shift in tree leaf phenology.ECOPRINT 24: 29-36, 2017

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An annotated list of the flora of the Bisley Area Luquillo Experimental Forest, Puerto Rico 1987 to 1992

10.2737/so-gtr-094 ◽

1993 ◽

Cited By ~ 1

Author(s):

Jesus Danilo Chinea ◽

Renee J. Beymer ◽

Carlos Rivera ◽

Ines Sastre de Jeses ◽

F.N. Scatena

Keyword(s):

Puerto Rico ◽

Luquillo Experimental Forest ◽

Annotated List

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Luquillo Experimental Forest canopy trimming experiment data

Forest Service Research Data Archive ◽

10.2737/rds-2019-0051 ◽

2019 ◽

Cited By ~ 1

Author(s):

Grizelle González ◽

Ashley E. Van Beusekom ◽

Sarah Stankavich ◽

Jess K. Zimmerman ◽

Alonso Ramírez

Keyword(s):

Forest Canopy ◽

Experiment Data ◽

Luquillo Experimental Forest

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Diverse sources of resistance to Spodoptera litura (F.) in groundnut

Indian Journal of Genetics and Plant Breeding (The) ◽

10.31742/ijgpb.79s.1.8 ◽

2019 ◽

Vol 79 (01S) ◽

Author(s):

M. A. Saleem ◽

G. K. Naidu ◽

H. L. Nadaf ◽

P. S. Tippannavar

Keyword(s):

Recombinant Inbred ◽

Spodoptera Litura ◽

Hot Spot ◽

Recombinant Inbred Lines ◽

Insect Pest ◽

Inbred Lines ◽

Leaf Damage ◽

Botanical Variety ◽

Resistant Genotypes ◽

Botanical Varieties

Spodoptera litura an important insect pest of groundnut causes yield loss up to 71% in India. Though many effective chemicals are available to control Spodoptera, host plant resistance is the most desirable, economic and eco-friendly strategy. In the present study, groundnut mini core (184), recombinant inbred lines (318) and elite genotypes (44) were studied for their reaction to Spodoptera litura under hot spot location at Dharwad. Heritable component of variation existed for resistance to Spodoptera in groundnut mini core, recombinant inbred lines and elite genotypes indicating scope for selection of Spodoptera resistant genotypes. Only 29 (15%) genotypes belonging to hypogaea, fastigiata and hirsuta botanical varieties under mini core set, 15 transgressive segregants belonging to fastigiata botanical variety among 318 recombinant inbred lines and three genotypes belonging to hypogaea and fastigiata botanical varieties under elite genotypes showed resistance to Spodoptera litura with less than 10% leaf damage. Negative correlation existed between resistance to Spodoptera and days to 50 per cent flowering indicating late maturing nature of resistant genotypes. Eight resistant genotypes (ICG 862, ICG 928, ICG 76, ICG 2777, ICG 5016, ICG 12276, ICG 4412 and ICG 9905) under hypogaea botanical variety also had significantly higher pod yield. These diverse genotypes could serve as potential donors for incorporation of Spodoptera resistance in groundnut.

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In Vitro Screening of Azalea for Resistance to Azalea Lace Bug

HortScience ◽

10.21273/hortsci.33.3.506b ◽

1998 ◽

Vol 33 (3) ◽

pp. 506b-506

Author(s):

Carol D. Robacker ◽

S.K. Braman

Keyword(s):

Leaf Damage ◽

In Vitro Screening ◽

Screening Assay ◽

Delaware Valley ◽

In Vitro Techniques ◽

Culture Tube ◽

Lace Bug ◽

Lace Bugs ◽

Laboratory Bioassays

Azalea lace bug (Stephanitis pyrioides) is the most serious pest on azalea. Results of laboratory bioassays and field evaluations of 17 deciduous azalea taxa have identified three resistant taxa: R. canescens, R. periclymenoides, and R. prunifolium. Highly susceptible taxa are `Buttercup', `My Mary', R. oblongifolium, and the evergreen cultivar `Delaware Valley White'. To determine whether in vitro techniques would have potential value in screening or selecting for resistance, or for the identification of morphological or chemical factors related to resistance, an in-vitro screening assay was developed. In-vitro shoot proliferation was obtained using the medium and procedures of Economou and Read (1984). Shoots used in the bioassays were grown in culture tubes. Two assays were developed: one for nymphs and one for adult lace bugs. To assay for resistance to nymphs, `Delaware Valley White' leaves containing lace bug eggs were disinfested with 70% alcohol and 20% commercial bleach, and incubated in sterile petri plates with moistened filter paper until the nymphs hatched. Five nymphs were placed in each culture tube, and cultures were incubated for about 2 weeks, or until adults were observed. To assay for resistance to adults, five female lace bugs were placed in each culture tube and allowed to feed for 5 days. Data collected on survival and leaf damage was generally supportive of laboratory bioassays and field results. Adult lace bugs had a low rate of survival on resistant taxa. Survival of nymphs was somewhat reduced on resistant taxa.

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Effect of Irradiance Level and Paclobutrazol on Reducation of Leaf Damage in Begonia × cheimantha

HortScience ◽

10.21273/hortsci.33.3.446d ◽

1998 ◽

Vol 33 (3) ◽

pp. 446d-446

Author(s):

Beyounghan Yoon ◽

Harvey J. Lang

Keyword(s):

Day Treatment ◽

Leaf Damage ◽

Growth Retardants ◽

Damage Development ◽

Long Day ◽

Leaf Chlorosis ◽

Shade Cloth ◽

Growing Conditions ◽

Reduced Light ◽

Shade Plants

Begonia × cheimantha (Christmas or Lorraine begonia) is a popular holiday crop in Europe, with certain cultivars having outstanding postharvest characteristics. Its commercial production in the southern United States has been limited by the occurrence of mottled leaf chlorosis and necrosis, apparently due to environmental stress. In this study, B. × cheimantha `Emma' was grown in the fall in a glass greenhouse at College Station, Texas, under either 0%, 60%, or 87% polyethylene shade cloth. Leaf chlorosis and necrosis was very severe on plants grown in full sun (≈650 mol·m–2·s–1), with slight chlorosis on plants under 60% shade. Plants under full sun, however, were more compact, flowered earlier, and had shorter peduncles with more flowers than those grown under shade. Reducing the vegetative long-day treatment period from 7 to 4 weeks had no effect on leaf damage development. Plants treated with paclobutrazol were shorter and had less leaf damage than untreated plants. Leaves of treated plants had a relatively higher concentration of soluble protein, chlorophyll, and enhanced activities of ascorbate peroxidase (AsA), dehydroascorbate (DHA) reductase, and monodehydro-ascorbate (MDHA) reductase than untreated plants. For Texas growing conditions, these preliminary studies indicate that B. × cheimantha should be grown under reduced light intensities, with excessive height and leaf damage being controlled with growth retardants such as paclobutrazol.

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Modelling leaf phenology of some trees with accumulated temperature in a temperate forest in northeast China

Forest Ecology and Management ◽

10.1016/j.foreco.2021.119085 ◽

2021 ◽

Vol 489 ◽

pp. 119085

Author(s):

Zhenzhao Xu ◽

Qijing Liu ◽

Wenxian Du ◽

Guang Zhou ◽

Lihou Qin ◽

...

Keyword(s):

Northeast China ◽

Temperate Forest ◽

Leaf Phenology ◽

Accumulated Temperature

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Salinity Tolerance of Four Hardy Ferns from the Genus Dryopteris Adans. Grown under Different Light Conditions

Agronomy ◽

10.3390/agronomy11010049 ◽

2020 ◽

Vol 11 (1) ◽

pp. 49

Author(s):

Piotr Salachna ◽

Rafał Piechocki

Keyword(s):

Light Stress ◽

Leaf Damage ◽

Light Conditions ◽

Reduced Height ◽

Individual Taxon ◽

Necrotic Spots ◽

Sun And Shade ◽

Tolerance To Salinity ◽

Leaf Greenness ◽

Ground Part

Hardy ferns form a group of attractive garden perennials with an unknown response to abiotic stresses. The aim of this study was to evaluate the tolerance of three species of ferns of Dryopteris genus (D. affinis, D. atrata and D. filix-mas) and one cultivar (D. filix-mas cv. “Linearis-Polydactylon”) to salinity and light stress. The plants were grown in full sun and shade and watered with 50 and 100 mM dm−3 NaCl solution. All taxa treated with 100 mM NaCl responded with reduced height, leaf greenness index and fresh weight of the above-ground part. In D. affinis and D. atrata salinity caused leaf damage manifested by necrotic spots, which was not observed in the other two taxa. The effect of NaCl depended on light treatments and individual taxon. D. affinis and D. atrata were more tolerant to salinity when growing under shade. Contrary to that, D. filix-mas cv. “Linearis-Polydactylon” seemed to show significantly greater tolerance to this stress under full sun. Salt-treated D. filix-mas cv. “Linearis-Polydactylon” plants accumulated enhanced amounts of K+ in the leaves, which might be associated with the taxon’s tolerance to salinity. Among the investigated genotypes, D. filix-mas cv. “Linearis-Polydactylon” seemed the most and D. affinis and D. atrata the least tolerant to salinity and light stress.

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