Kinase that can phosphorylate the tocopherol cyclase VTE1, a key enzyme of tocopherol (vitamin E) metabolism and involved in the recycling of oxidated alpha-tocopherol quinone, possibly stabilizing it at plastoglobules. Regulates also plastoglobule protein composition (PubMed:24267661). Prevents photodamage of chloroplasts under continuous red light, thus working in opposition to ABC1K3 (PubMed:25882344). Together with ABC1K1, contributes to plastoglobule (PG) function in prenyl-lipid metabolism, stress response, and thylakoid remodeling (PubMed:23673981, PubMed:24267661). Involved in chlorophyll degradation and in the maintenance of the number of chlorophyll-binding photosynthetic thylakoid membranes (PubMed:22447966). Ensures photosynthetic electron transport by regulating the homeostasis of plastoquinone, beta-carotene and xanthophyll lutein, as well as membrane antioxidant tocopherol metabolism (PubMed:24267661). Seems to affect specifically stability or turnover of D1 protein, product of psbA, one of the four core subunits of the photosystem II (PSII) (PubMed:25882344). Required for photooxidative stress responses, including the induction of oxidative stress response genes (e.g. FSD1, CSD1, CAT1, and UTG71C1), to prevent photosystem II core and chlorophyll degradations (PubMed:22447966, PubMed:23673981, PubMed:24267661). ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with ABC1K3 in plastoglobules (PG). Expressed in all tissues (e.g. especially in leaves) at all developmental stages from seed germination to flowering, except in the root tips. Up-regulated by methyl viologen (paraquat, MV) treatment, a herbicide triggering photooxidative stress. High chlorophyll fluorescence and reduced non-photochemical quenching (NPQ) caused by defects in photosynthetic electron transport. Specifically deficient in the electron carrier plastoquinone, as well as in beta-carotene and the xanthophyll lutein, and defective in membrane antioxidant tocopherol metabolism. Altered plastoglobule protein composition (PubMed:24267661). Abnormal development with albino cotyledons and paler mesophyll cells leading to yellow-green leaves due to reduced contents of carotenoids and chlorophyll, as well as changes in the numbers of chlorophyll-binding proteins of the photosynthetic complexes (PubMed:22447966, PubMed:24267661, PubMed:25882344). In bdr1-1 and bdr1-2, increased accumulation of anthocyanin under red and blue light conditions. Exposure to red light for 5 days leads to dwarf plants with pale green rosette leaves. Reduced level of D1 protein, product of psbA, one of the four core subunits of the photosystem II (PSII) (PubMed:25882344). Increased levels of chlorophyll degradation products such as chlorophyllide (Chlide) a and pheophorbide a. Stronger photosynthetic and metabolic perturbations in response to high light stress and methyl viologen (paraquat, MV), a herbicide triggering photooxidative stress, strongly affecting carbohydrate metabolism (PubMed:22447966, PubMed:24267661). However, the mutant acclimates to high light after 7 days together with a recovery of carotenoid levels and a drastic alteration in the starch-to-sucrose ratio (PubMed:24267661). Lower transcript levels of the oxidative stress response genes FSD1, CSD1, CAT1, and UTG71C1 after MV treatment (PubMed:22447966). Conditional light stress phenotype in the double mutant abc1k1 abc1k3 that displays rapid chlorosis upon high light stress and slower, but irreversible, senescence-like phenotype during moderate light stress, drought or nitrogen limitation, but not cold stress. This senescence-like phenotype is associated with the degradation of the photosystem II core and up-regulation of chlorophyll degradation. Modified prenyl-lipid composition in plastoglobules (PG) probably due to reduced VTE1 activity and loss of CCD4. Abnormal recruitment of plastid jasmonate biosynthesis enzymes in PG (PubMed:23673981). Belongs to the protein kinase superfamily. ADCK protein kinase family.