Molecular Plant∣GA在控制植物營養生長（runner）和生殖生長（flowering）方面的作用

2017年12月14日Molecular Plant在線文章，該文章為一篇spotlight，介紹了GA在調控植物生長和作物產量過程中多方面的功能。

原題目為：

To bring flowers or do a runner - GAs make the decision

圖1. GA在控制植物生長和作物產量中多方面的功能。

GA可以直接或間接的控制植物發育的幾個過程。在GA水平升高的情況下，DELLA降解，DELLA-GAF1複合物形成被抑制。這通過（1）和（2）減少GA的生物合成和促進生長而達到極致。同樣，GAs可以通過DELLA降解或直接作用促進種子萌發（3）。根生長是由GAs直接促進，或通過HDT間接促進【HDT抑制GA2ox2表達，從而增加GAs水平】（4）。GAs還可以調控繁殖策略，提高植物產量，這種情況尤其出現在草莓和馬鈴薯中（5），因為高的GAs水平可以使腋芽分化為生殖性分支或匍匐莖。綠色箭頭表示上調過程，紅線條形線表示抑制過程。

Figure 1. The multifaceted functions of GA in controlling plant growth and crop yield. Gibberellin action controlling several processes in plant development can be either direct or indirect. Under elevated levels of GA, DELLA is degraded and thus DELLA-GAF1 complex formation is inhibited. This culminates with the reduction of the biosynthesis of GA and the promotion of growth via (1) and (2). Similarly, GAs promotes seed germination either through DELLA degradation or directly (3). Root growth is directly promoted by GAs or indirectly via HDT, which inhibits GA2ox2 expression and consequently increases GAs levels (4). GAs can also mediate the propagation decision and increase plant yield, particularly in strawberry and potato (5), given that high GAs levels allow axillary buds to differentiate in productive branches (fruits production) or stolon/runner (special branch that is propagative in strawberry and productive in potato). Green arrows show processes upregulation, whereas bar-ended red lines show process inhibition. Abbreviations: AXM: axillary meristem; GAF1: GAI-ASSOCIATED FACTOR1; PIF: PHYTOCHROME INTERACTING FACTORS; BZR: BRASSINAZOLE RESISTANT; DOF: DNA-BINDING ONE ZINC FINGER6; HDT: HISTONE DEACETYLASE, TPR: TOPLESS RELATED.

每日一詞

culminate

英[?k?lm?ne?t]

美[?k?lm??net]

vt. 達到極點;

[例句]They had an argument, which culminated in Tom getting drunk

他們爭論了一番，最後湯姆喝醉了。

[其他] 第三人稱單數：culminates 現在分詞：culminating 過去式：culminated 過去分詞：culminated

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