Kobe University

Bunkoukeiki Co., Ltd.

Kyoto University

Takayuki Sohtome

Chikahiro Miyake

Kentaro Ifuku

Shoko Tsuji

Yufen Che

The present invention relates to an improved technology for a device that identifies and diagnoses an environmental stress state of plants. An environmental stress diagnosis device comprises a measurement light source, an induction light source, and a transmitted light detector. The measurement light sourceradiates a first measurement light MLand a second measurement light MLto a plant sample S, the induction light sourceradiates a first photosynthesis inducing light FR and a second photosynthesis inducing light AL to the plant sample S, and the transmitted light detectordetects a first transmitted light TLand a second transmitted light TL. The control unithas an analysis circuitand a control circuit. The analysis circuitcalculates a light absorption difference between the first transmitted light TLand the second transmitted light TL, and calculates Y(ND) which is a state in which P700 in photosystem I in photosynthesis has been oxidized as a ROS marker (a reactive oxygen species suppression index) for plants by utilizing the light absorption difference. The analysis circuitdiagnoses an environmental stress state of plants by utilizing the ROS marker.

Device for diagnosing environmental stress in plants and method for diagnosing environmental stress

The present invention relates to an improved technology for a device that identifies and diagnoses an environmental stress state of plants. A control circuitcontrols a measurement light sourcesuch that a second measurement light MLhas higher power than a first measurement light MLand the first measurement light MLand the second measurement light MLbecome opposite-phase rectangular waves, and further controls the measurement light sourcesuch that the first measurement light MLand the second measurement light MLare output in synchronization to form the first measurement light MLand the second measurement light MLinto a quasi-single composite rectangular wave measurement light MLof 5 kHz to 30 kHz. A transmitted light detectordetects the composite rectangular wave measurement light MLtransmitted through a plant sample S as a composite rectangular wave transmitted light TL. An analysis circuitcalculates a light absorption difference by utilizing the composite rectangular wave transmitted light TL, and calculates Y(ND) which is an oxidized state of P700 as a ROS marker utilizing the light absorption difference, and diagnoses an environmental stress state of plants by utilizing the ROS marker.

Diagnosis device for environmental stress in plants and environmental stress diagnosis method

Growing community of inventors

Hachioji, Japan

Takayuki Sohtome