title: Synchrotron X-ray phase contrast imaging of leaf venation in soybean (Glycine max) after exclusion of solar UV (280-400 nm) radiation.
abstract: The hydraulic efficiency of a leaf depends on its vascular structure as this is responsible for transport activities. To investigate the effect of exclusion of UVAB and UVB radiation from the solar spectrum on the micro-structure of leaves of soybean (Glycine max, variety JS-335), a field experiment was conducted using synchrotron-based phase contrast imaging (PCI). Plants were grown in specially designed UV exclusion chambers, and wrapped with filters that excluded UVB (280-315 nm) or UVAB (280-400 nm), or transmitted all the ambient solar UV (280-400 nm) radiation (filter control). Qualitative observation of high-resolution X-ray PCI images obtained at 10 keV has shown the differences in major and minor vein structures of the leaves. The mid-rib width of the middle leaflet of third trifoliate leaves, for all treatments, were obtained using quantitative image analysis. The width of the mid-rib of the middle leaflet of third trifoliate leaves of UVB excluded plants was found to be more compared to leaves of filter control plants, which are exposed to ambient UV. The mid-rib or the main conducting vein transports water and sugars to the whole plant; therefore, mid-rib enhancement by the exclusion of solar UV radiation possibly implies enhancement in the leaf area which in turn causes an increased rate of photosynthesis.
authors.affiliation: UGC-DAE, Consortium for Scientific Research, University Campus, Khandwa Road, Indore (MP), India.
authors.forename: A
authors.initials: A
authors.lastname: Fatima
authors.affiliation: School of Life Sciences, DAVV, Khandwa Road, Indore (MP), India.
authors.forename: S
authors.initials: S
authors.lastname: Kataria
authors.affiliation: School of Life Sciences, DAVV, Khandwa Road, Indore (MP), India.
authors.forename: K N
authors.initials: KN
authors.lastname: Guruprasad
authors.affiliation: Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Agrawal
authors.affiliation: Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India.
authors.forename: B
authors.initials: B
authors.lastname: Singh
authors.affiliation: Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India.
authors.forename: P S
authors.initials: PS
authors.lastname: Sarkar
authors.affiliation: UGC-DAE, Consortium for Scientific Research, University Campus, Khandwa Road, Indore (MP), India.
authors.forename: T
authors.initials: T
authors.lastname: Shripathi
authors.affiliation: Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India.
authors.forename: Y
authors.initials: Y
authors.lastname: Kashyap
authors.affiliation: Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India.
authors.forename: A
authors.initials: A
authors.lastname: Sinha
mesh_terms: D018515:Plant Leaves; D013025:Glycine max; D013472:Sunlight; D017356:Synchrotrons; D014466:Ultraviolet Rays; D014965:X-Rays
keywords: UV exclusion; micro-imaging; phase contrast imaging (PCI); soybean