Cellulose content of rice leaves was measured as described39 (link). Briefly, the 2nd leaves were harvested from 2-week-old seedlings prior to and after dehydration stress for preparation of the alcohol insoluble residue, which weighed and extracted with acetic/nitric reagent. The samples were then hydrolyzed with 67% sulfuric acid and the released glucose was quantified with anthrone reagent (Fisher).
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