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Xiaotao Ding, Liyao Yu, Yuping Jiang, Shaojun Yang, Lizhong He, Qiang Zhou, Jizhu Yu, and Danfeng Huang

length, width, and area measurements. The length and width of 15 leaves from the bottom to the top were measured with a caliper, and the mean of every leaf length and width was calculated. Leaf length was measured from the lamina tip to the intersection

Open access

Koichi Nomura, Eriko Wada, Masahiko Saito, Hiromi Yamasaki, Daisuke Yasutake, Tadashige Iwao, Ikunao Tada, Tomihiro Yamazaki, and Masaharu Kitano

In the horticultural crop production of leafy vegetables, it is of practical importance to monitor crop size indicators such as the leaf area index (LAI), leaf fresh weight (LFW), and leaf length (LL). LAI, defined as half the total leaf area per

Free access

Alexander R. Kowalewski, Brian M. Schwartz, Austin L. Grimshaw, Dana G. Sullivan, and Jason B. Peake

before the initiation of traffic. Measurements of leaf morphology included the leaf length, leaf width, and leaf angle. Leaf length and leaf width were assessed using an electronic digital caliper with 0.001 mm readability. Leaf angle was measured on a 1

Open access

J. C. Ascenso and R. K. Soost

Abstract

Mathematical relationships between leaf surface area and linear dimensions were investigated in 12 citrus seedling populations, in order to provide a non-destructive method of leaf area estimation. Curvilinear functions of the general form y = βxα were obtained, where y is leaf area; x represents leaf length or width and; α and β are constants. A better fit was achieved by power functions of the general form z = γxαyβ, where x, y and z are length, width and area of leaves, respectively, and α, β and γ are constants. These regressions were used to estimate leaf areas in each population. A single equation for all 12 populations was then obtained and used to construct tables, which give individual leaf areas after entries for length and width.

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Yoshiaki Kitaya, Genhua Niu, Toyoki Kozai, and Maki Ohashi

Lettuce (Lactuca sativa L. cv. Summer-green) plug transplants were grown for 3 weeks under 16 combinations of four levels (100, 150, 200, and 300 μmol·m-2·s-1) of photosynthetic photon flux (PPF), two photoperiods (16 and 24 h), and two levels of CO2 (400 and 800 μmol·mol-1) in growth chambers maintained at an air temperature of 20 ±2 °C. As PPF increased, dry mass (DM), percent DM, and leaf number increased, while ratio of shoot to root dry mass (S/R), ratio of leaf length to leaf width (LL/LW), specific leaf area, and hypocotyl length decreased. At the same PPF, DM was increased by 25% to 100% and 10% to 100% with extended photoperiod and elevated CO2 concentration, respectively. Dry mass, percent DM, and leaf number increased linearly with daily light integral (DLI, the product of PPF and photoperiod), while S/R, specific leaf area, LL/LW and hypocotyl length decreased as DLI increased under each CO2 concentration. Hypocotyl length was influenced by PPF and photoperiod, but not by CO2 concentration. Leaf morphology, which can be reflected by LL/LW, was substantially influenced by PPF at 100 to 200 μmol·m-2·s-1, but not at 200 to 300 μmol·m-2·s-1. At the same DLI, the longer photoperiod promoted growth under the low CO2 concentration, but not under the high CO2 concentration. Longer photoperiod and/or higher CO2 concentration compensated for a low PPF.

Free access

Carole L. Bassett, D. Michael Glenn, Philip L. Forsline, Michael E. Wisniewski, and Robert E. Farrell Jr

measurements. Plant material from the core collection was sampled in the late summer of 2005 and leaf area, leaf length and width, and leaf perimeter were measured with a Model CI-203 leaf area meter (CID Bio-Science Inc., Camas, WA) on fully expanded leaves at

Open access

Xiaotao Ding, Hongmei Zhang, Lizhong He, Haijun Jin, Qiang Zhou, Juan Yang, Weimin Zhu, Jizhu Yu, and Tingting Qian

. 2015. Five plants from each cultivar were selected for continuous nondestructive measurement. Four structural parameters—leaf length and leaf width (all unfolded leaves from the bottom to the top), and plant height and width—were measured with

Full access

Alan Zuk, Qi Zhang, Ted Helms, and Harlene Hatterman-Valenti

landscape plant. To determine leaf length and flower height, the longest leaf and tallest flower of each plant were measured (in Oct. 2012–13) to the closest centimeter from the soil surface to the tip of the leaf or flower. The longest leaf was artificially

Free access

Winston Elibox and Pathmanathan Umaharan

colors of the spathe, spadix, and peduncle were also recorded using a horticultural color chart (Wilson Color Ltd., U.K.). Leaf parameters were measured using the second fully opened leaf. Leaf length was taken as the linear distance from the uppermost

Free access

John R. Stommel and Robert J. Griesbach

practices. Table 1. Mean values and sd s for mature pepper fruit color, fruit length/fruit diameter at midpoint, number of fruit per cluster, leaf color, leaf length, leaf width, plant height, and plant diameter in parental, F 1 , F 2 , and