The trans-zeatin-type side-chain modification of cytokinins controls rice growth

The trans-zeatin-type cytokinins are biosynthesized via the cytochrome P450 monooxygenases CYP735As and control growth of both roots and shoots in rice. Cytokinins (CKs), a class of phytohormones with vital roles in growth and development, occur naturally with various side-chain structures, including N-6-(Delta(2)-isopentenyl)adenine-, cis-zeatin- and trans-zeatin (tZ)-types. Recent studies in the model dicot plant Arabidopsis (Arabidopsis thaliana) have demonstrated that tZ-type CKs are biosynthesized via cytochrome P450 monooxygenase (P450) CYP735A and have a specific function in shoot growth promotion. Although the function of some of these CKs has been demonstrated in a few dicotyledonous plant species, the importance of these variations and their biosynthetic mechanism and function in monocots and in plants with distinctive side-chain profiles other than Arabidopsis, such as rice (Oryza sativa), remain elusive. In this study, we characterized CYP735A3 and CYP735A4 to investigate the role of tZ-type CKs in rice. Complementation test of the Arabidopsis CYP735A-deficient mutant and CK profiling of loss-of-function rice mutant cyp735a3 cyp735a4 demonstrated that CYP735A3 and CYP735A4 encode P450s required for tZ-type side-chain modification in rice. CYP735As are expressed in both roots and shoots. The cyp735a3 cyp735a4 mutants exhibited growth retardation concomitant with reduction in CK activity in both roots and shoots, indicating that tZ-type CKs function in growth promotion of both organs. Expression analysis revealed that tZ-type CK biosynthesis is negatively regulated by auxin, abscisic acid, and CK and positively by dual nitrogen nutrient signals, namely glutamine-related and nitrate-specific signals. These results suggest that tZ-type CKs control the growth of both roots and shoots in response to internal and environmental cues in rice.

Automated summary

Trans-zeatin-type cytokinins are synthesized by the cytochrome P450 monooxygenases CYP735As in rice and control the growth of both roots and shoots. These cytokinins have been shown to be important for shoot growth promotion in the model plant Arabidopsis. However, their role in monocots and plants with different side-chain profiles like rice is not well understood. In this study, the researchers characterized CYP735A3 and CYP735A4 and found that they are required for the modification of trans-zeatin-type side chains in rice. They also discovered that trans-zeatin cytokinins regulate the growth of both roots and shoots in response to various internal and environmental signals.