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Daun Putri Malu Mengatup Saat disentuh? ini Alasannya

putri malu 2

Daun Putri Malu Mengatup Saat disentuh? ini Alasannya

Hallo sahabat Terraversity, kalian tau kan pohon putri malu? Pernahkah kalian menyentuh daun putri malu lalu daunnya langsung mengatup? Biasanya daun putri malu tumbuh bebas di semak-semak sehingga kalian masih sering menjumpai terutama kalian yang tinggal diperdesaan. Penasaran ga nich kenapa kok bisa yah cuma disentuh aja bisa mengatup padahal daun-daun pohon lain jika disentuk biasa aja ge berubah sama sekali?

 

Pohon Putri Malu

Putri malu memiliki nama dalam bahasa latin Mimosa pudica Linn, tanaman ini awalnya berasal dari Amerika. Di Indonesia tanaman ini juga banyak ditemukan. Tanaman Mimosa pudica Linn masuk dalam kelompok dikotil, memiliki duri kecil dibagian batang, dapat berbunga dengan bentuk bulat yang berwarna merah muda. Dan yang menjadi ciri khas putri malu daunnya dapat mengatup jika disentuh.

putri malu 1

 

Tumbuhan ini memiliki dua kepekaan antara lain pertama, kepekaan terhadap sentuhan (seismonasti). Dalam hal ini tidak peduli rangsangan bersal dari manapun daun Mimosa pudica Linn akan mengatupkan daunnya. Kedua kepekaan terhadap cahaya matahari (niktinasti), pada saat matahari terbenam daun ini akan mengatup dengan sendirinya, nah saat matahari terbit daun ini akan membuka dengan sendirinya. Karena daunnya lelah sehingga dia butuh istirahat untuk tidur pada malam hari. Ibaratnya kita saja manusia butuh istirahat tidak seharian penuh terus beraktivitas. Tak ingin kerja lembur bagai kuda wkwkw… Tumbuhan kan juga termasuk mahkluk hidup jadi butuh tidur.

 

Baca juga artikel :

COKLAT DAPAT MENGHILANGKAN STRES ? MITOS ATAU FAKTA    

 

Proses Mengatupnya Daun Putri Malu

 

Gerak seismonasti dan niktinasti termasuk ke dalam gerak nasti. Gerak nasti artinya gerak yang tidak dipengaruhi oleh arah datangnya rangsang. Jadi jika ada rangsang yang mendekat entah dari mana asalnya yang penting daun putri malu akan mengatup. Adanya rangsangan dari luar ini mengakibatkan perubahan tekanan turgor pada sel-sel batang, cabang dan daun. Apa itu tekanan turgor? Tekanan turgor artinya tekanan air yang terdapat pada dinding sel yang terjadi akibat adanya perubahan kadar air dalam sel tumbuhan (Parhusip, 2010)

Ketika bagian pohon putri malu disentuh, saat itu terjadi aliran air menjauhi daerah sentuhan. Nah aliran air ini akan membuat kadar air di daerah sentuhan berkurang, akibatnya tekanan turgornya mengecil. Sehingga membuat tulang daun, cabang, bahkan batang menjadi layu kemudian diikuti dengan mengatupnya daun putri malu. Ibaratnya pohon putri malu seolah-olah pingsan sebentar karena lemas hehe. Apabila sudah tidak mengalami rangsangan maka lama-kelamaan akan kembali pada kondisi normal dimana batang, cabang dan tulang daun tidak layu lagi diikuti dengan daun akan terbuka kembali (Nilesh, 2009)

 

Daun Putri Malu Mengatup Pada Malam Hari

 

Bagaimana dengan mengatupnya daun putri malu saat malam hari? Hal ini karena saat malam hari intensitas cahaya matahari lama-kelamaan akan semakin berkurang. Respon yang terjadi dimulai yang daun yang paling atas baru kemuadin daun yang bawah akan mengatup. Proses dinamakan gerak tidur, dimana pohon putri malu butuh istirahat dengan cara menghentikan proses fotosintesis.

 

Saat daun berada pada posisi horizontal, sel-sel pada satu sisi akan membengkok, sedangkan sel pada posisi yang berlawanan akan menjadi layu dan lemah. Pada saat matahari mulai terbit kembali, pohon putri malu akan bangun dari tidur lelapnya. Kembali dalam kondisi normal dimana cabang, batang tidak layu yang ditandai dengan membukanya semua daun. Eeits ternyata udah pagi, yok memulai pagi hari dengan senyuman manis agar semangat beraktivitas hehehe.. lho lho pohon aja bisa senyum masa kita engga ???

 

Baca juga artikel :

JURUSAN KULIAH SEPI PEMINAT BAGUS GAK SIH BUAT KARIR?

 

Sebenarnya buat apa sih putri malu mengatupkan daunnya saat mendapat rangsanga? Tujuannya untuk melindungi diri dari mangsanya. Jadi ceritanya dia pura-pura pingsan agar dikira sudah mati. Selain pura-pura pingsan, warna daun putri malu ketika mendapat rangsangan juga berubah menjadi pucat, tidak segar, dan layu sehingga hewan yang niat awalnya ingin memangsa makanan enak dan segar menjadi tidak selera karena warnanya berubah pucat (Syaiful, 2009).

 

Sahabat Terraversity begitulah alasan mengapa daun putri malu seolah pemalu sekali mendapat rangsangan sedikit saja langsung menutup diri. Ini juga menjadi alasan pohon tersebut diberi nama “putri malu” . demikian artikel kali ini semoga bermanfaat dan sampai ketemu di artikel berikutnya yah ….

 

Referensi

Nilesh Kumar, et al 2009.  Mimosa Pudica L. A Sensitive Plant Lovely Professional University  College Of Pharmacy And Technology. International Journal Of Pharmacy And Pharmaceutical Sciences, Vol. 1, Issue 2

Parhusip, A. J. N., Friska, E., & Saputra, R. D. 2010. Potensi aktivitas antimikroba ekstrak mimosa pudica l. terhadap mikroba patogen pangan. Jurnal Ilmu dan Teknologi Pangan, 8(1), 45-54.

Syaiful, Arif. 2009. Pengaruh Ekstrak Herba Mimosa Pudica Linn  Terhadap Efek Sedasi Pada Mencit Balb/C. Program Pendidikan Sarjana Fakultas Kedokteran. Undip

 

 

 

Ema
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