Results 31 to 40 of about 6,131,953 (294)

Exploring Multisource Feature Fusion and Stacking Ensemble Learning for Accurate Estimation of Maize Chlorophyll Content Using Unmanned Aerial Vehicle Remote Sensing

open access: yesRemote Sensing, 2023
Crop chlorophyll content measuring plays a vital role in monitoring crop growth and optimizing agricultural inputs such as water and fertilizer. However, traditional methods for measuring chlorophyll content primarily rely on labor-intensive chemical ...
Weiguang Zhai   +4 more
doaj   +1 more source

Effect of measure units on estimating crop LEAF chlorophyll content with remote sensing

open access: yesThe Journal of Engineering, 2019
Vegetation chlorophyll content is very important for monitoring the growth and health status of vegetation. Remote sensing of chlorophyll content holds an important potential for evaluating crop growth status and diseases and insects.
Chao Wang   +4 more
doaj   +1 more source

Genetic segregation of chlorophyll content and light compensation point in a hybrid grapevine population [PDF]

open access: yesGuoshu xuebao
[Objective] The growth and development of grapes are closely linked to light intensity. The efficiency of photosynthesis and nutrient accumulation directly affects grape yield and quality. In greenhouse or protected cultivation environments, grape growth
JI Xiaohao   +6 more
doaj   +1 more source

Genetic mapping of physiological traits associated with terminal stage drought tolerance in rice

open access: yesBMC Genetics, 2020
Background Drought during reproductive stage is among the main abiotic stresses responsible for drastic reduction of grain yield in rainfed rice. The genetic mechanism of reproductive stage drought tolerance is very complex.
Saumya Ranjan Barik   +4 more
doaj   +1 more source

Vertical distributions of chlorophyll in deep, warm monomictic lakes [PDF]

open access: yes, 2010
The factors affecting vertical distributions of chlorophyll fluorescence were examined in four temperate, warm monomictic lakes. Each of the lakes (maximum depth >80 m) was sampled over 2 years at intervals from monthly to seasonal.
Brookes, Justin D.   +16 more
core   +1 more source

REACTIVITY OF CHLOROPHYLL a/b-PROTEINS AND MICELLAR TRITON X-100 COMPLEXES OF CHLOROPHYLLS a OR b WITH BOROHYDRIDE [PDF]

open access: yes, 1989
The reaction of several plant chlorophyll-protein complexes with NaBH4 has been studied by absorption spectroscopy. In all the complexes studied, chlorophyll b is more reactive than Chi a, due to preferential reaction of its formyl substituent at C-7 ...
Jan M. Anderson   +6 more
core   +1 more source

Cloning and characterisation of chlorophyll synthase from Avena sativa [PDF]

open access: yes, 2001
The chlorophyll synthase gene from oat (Avena sativa) was cloned and expressed in Escherichia coli. The deduced amino acid sequence consists of 378 amino acids including a presequence, of 46 amino acids.
Kögel, Julia   +4 more
core   +1 more source

SPAD-502 readings in response to photon fluence in leaves with different chlorophyll content

open access: yesRevista Ceres, 2010
The chlorophyll meter (SPAD-502) is widely used to estimate chlorophyll content, but non-uniform chloroplast distribution can affect its accuracy. This study aimed to assess the effect of photon fluence (F, irradiance x time of illumination) in leaves ...
Helena Cristina Santos Nascimento   +1 more
doaj   +1 more source

The derivation of the formyl-group oxygen of chlorophyll b in higher plants from molecular oxygen. [PDF]

open access: yes, 1994
The mechanism of formation of the formyl group of chlorophyll b has long been obscure but, in this paper, the origin of the 7-formyl-group oxygen of chlorophyll b in higher plants was determined by greening etiolated maize leaves, excised from dark-grown
Edmund CMIEL   +9 more
core   +1 more source

Spectral response of chlorophyll content during leaf senescence in European beech trees [PDF]

open access: yes, 2020
Leaf chlorophyll content declines in response to environmental stressors and during natural senescence periods. Assessments of forest health and vulnerability to stressors require repeated measurements of forest health to quantify declines in chlorophyll
Donoghue, Daniel   +7 more
core   +1 more source

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