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Fig. 4 | Rice

Fig. 4

From: Heat Stress During Gametogenesis Irreversibly Damages Female Reproductive Organ in Rice

Fig. 4

Mature embryo sac at heading stage (post-stress recovery) in IR64 plants exposed to six days of control (30 °C, panel A) and heat stress (38 °C—HT38; 40 °C—HT40, panels B to F) during gametogenesis. (A) A normal mature embryo sac with antipodal cells (AN), two polar nuclei (PN), two synergid cells (SY) and one egg cell (EC) under control (30 ℃); (B) Degenerated embryo sac, without differentiation of embryo sac cavity; (C) Abnormal embryo sac without female germ unit, including egg cell and polar nuclei (indicated by yellow arrows); (D) Abnormal embryo sac without egg cell (yellow arrow); (E) Abnormal embryo sac without egg cell (yellow arrow) and two polar nuclei located far from female units (white arrow); and (F) Egg cell and polar nuclei were at the wrong position (two polar nuclei were closer to micropylar region than the egg cell)

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