Showing papers on "Plant morphology published in 1995"
TL;DR: In hemp the relationship between yield and optimum plant density is approximated by the equation of its self-thinning line, and the late-flowering cultivar yielded more than the other two cultivars because it grew faster during the latter part of the growing season.
84 citations
TL;DR: Differences were evidenced according to plant species; for a same biomass E. canadensis and M. spicatum offered the highest surface area, P. pectinatus and N. obtusa the lowest and plants with dissected morphology did not necessarily offer the largest surface area per unit biomass.
78 citations
TL;DR: A comprehensive survey of insects and arachnids in a natural zone of overlap and hybridization between Fremont and narrowleaf cottonwood found that insect bioassays may be a more rigorous method of distinguishing closely related plant taxa than reliance solely on morphological or chemical analyses.
Abstract: Phytophagous insects are natural bioassays that may be used to segregate closely related plant taxa. To examine the value of this method, we conducted a comprehensive survey of insects and arachnids in a natural zone of overlap and hybridization between Fremont (Populus fremontii) and narrowleaf cottonwood (Populus angustifolia). Three categories of trees were distinguished by leaf morphology and identified by previous genetic analyses as Fremont, F1 and BC1 hybrids, and complex backcrosses (BC2–BC4). These trees were subsequently reclassified by a discriminant function analysis of their associated herbivores. The level of concordance between the two methods was 98% (n = 43 trees). Because insect distributions may reflect differences in plant morphology, chemistry, phenology, and other characters, insect bioassays may be a more rigorous method of distinguishing closely related plant taxa than reliance solely on morphological or chemical analyses. In contrast with chemical and genetic analyses, insect surv...
68 citations
Book•
01 Mar 1995
TL;DR: The results show clear trends in plant structure and function, which bode well for the development of sustainable agriculture in the coming years.
Abstract: V: PLANT STRUCTURE AND FUNCTION. 29. Plant Tissues. 30. Plant Nutrition and Transport. 31. Plant Reproduction. 32. Plant Growth and Development.
30 citations
TL;DR: The data indicate that GR application reduced leaf size, concentrated photosynthetic pigments and enzymes, and enhanced CER of corn.
Abstract: Growth retardant (GR) application often produces compact plants with dark green foliage and reduced leaf size. These morphological alterations can affect leaf gas exchange and biochemical traits associated with photosynthesis. We conducted greenhouse experiments by growing corn (Zea mays L.) plants under optimum water and nutrient conditions to evaluate the impact of two GR treatments, a seed-applied treatment of BAS110..W [1-(2,4-dichlorophenyl)-2-methoxy-1-methyl-2-(1H-1,2,4-triazol-1-yl) etnanol] at 250 mg kg −1 of seed and an ethephon (2-choloroethyl phosphonic acid) treatment (a foliar-applied solution containing 100 μg a.i ethephon L −1 of water applied at three-leaf stage), on leaf gas exchange characteristics [leaf stomatal conductance to H 2 O vapor (g s ), leaf intercellular CO 2 concentration (C i ), and leaf CO 2 exchange rate (CER)] and water use efficiency, and other plant morphological traits. A CER vs. C i response curve was also determined to assess the carboxylation efficiency for control and treated plants. Both GR reduced total plant leaf area and dry weight by about 21 to 31% relative to the control but increased specific leafweight and weighted stomatal density by 7 to 19%. Leaf protein and chlorophyll contents were nearly doubled in GR-treated plants. Leaf g s , C i , and CER were significantly higher in GR-treated vs. control plants while CER/g s was significantly lower in GR-treated plants. The CER vs. C i response curve exhibited higher initial slope in GR-treated plants compared to control plants, indicating a higher carboxylation efficiency. Our data indicate that GR application reduced leaf size, concentrated photosynthetic pigments and enzymes, and enhanced CER of corn
27 citations
01 Jan 1995
14 citations
Book•
01 Jan 1995
11 citations
01 Dec 1995
9 citations
TL;DR: Morphological study of the Plane tree shows that the root system of this species has a completely sympodial structure, which leads to a pseudomonopodial organization, never been observed in roots.
Abstract: Summary Morphological study of the Plane tree shows that the root system of this species has a completely sympodial structure. The layout of root sympodial units leads to a pseudomonopodial organization, never been observed in roots. The endogenous origin of this sympodial development is discussed. Abridged version Different works show us the occurence of sympodial branching in roots (Gill and Tomlinson, 1977; Oldeman, 1990). Usually, this type of branching is considered as a resuH of injury which accidentally destroy apical meristem (Wilson, 1970). Thus, analysis intended to understand structure and development of plane tree root system (Platanus hybrida Brat. Platanaceae) lead us to revise this interpretation. We made our observations in natural habHat near Montpellier in the South of France. We have completely freed root systems of thirty individuals from seedlings to aduHs developing Hs first main orthotropic branches. For each individual, we have described the morphology of each root taking in accoun...
01 Jan 1995