The keyword is high-volume for a reason: the hardcover retail price often exceeds $150–$200. Consequently, many students turn to free PDF copies circulating on academic file-sharing sites (Library Genesis, Z-Library, etc.). Here is what you need to know:
The textbook "Plant Physiology" by Taiz and Zeiger has been a cornerstone of plant physiology education for decades. First published in 1970, the book has undergone several revisions, with the 7th edition being the most recent. Throughout its history, the textbook has maintained its reputation for providing a comprehensive, engaging, and accessible introduction to plant physiology.
How plants sense their world and defend themselves against pathogens.
Extensive supplementary material including deep dives into specific research areas. Study Aids: