CABFocus on Crop Physiology
Offers a subscription to access regularly updated abstracts relevant to crop physiology.

CAB Focus on Plant Growth Regulators
Plant Growth Regulator Abstracts Online, updated weekly. Commercial service to which a free trial is available.

Plants in Action Textbook
Detail on the Australian plant physiology textbook.

Hadi Farazdaghi
Personal website of Hadi Farazdaghi, includes a paper on an alternative C3 photosynthesis model to that of Farquhar and Von Caemmerer.